| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 30 | 
                                                                 
                                    
                                    2%
                                 
                                                             | 
                                                        
                    
| 1 | One year or less | 29 | 
                                                                 
                                    
                                    1.9%
                                 
                                                             | 
                                                        
                    
| 2 | 50 | 
                                                                 
                                    
                                    3.3%
                                 
                                                             | 
                                                        
                    |
| 3 | 74 | 
                                                                 
                                    
                                    4.9%
                                 
                                                             | 
                                                        
                    |
| 4 | 56 | 
                                                                 
                                    
                                    3.7%
                                 
                                                             | 
                                                        
                    |
| 5 | 103 | 
                                                                 
                                    
                                    6.8%
                                 
                                                             | 
                                                        
                    |
| 6 | 70 | 
                                                                 
                                    
                                    4.6%
                                 
                                                             | 
                                                        
                    |
| 7 | 67 | 
                                                                 
                                    
                                    4.4%
                                 
                                                             | 
                                                        
                    |
| 8 | 58 | 
                                                                 
                                    
                                    3.8%
                                 
                                                             | 
                                                        
                    |
| 9 | 32 | 
                                                                 
                                    
                                    2.1%
                                 
                                                             | 
                                                        
                    |
| 10 | 136 | 
                                                                 
                                    
                                    9%
                                 
                                                             | 
                                                        
                    |
| 11 | 26 | 
                                                                 
                                    
                                    1.7%
                                 
                                                             | 
                                                        
                    |
| 12 | 41 | 
                                                                 
                                    
                                    2.7%
                                 
                                                             | 
                                                        
                    |
| 13 | 29 | 
                                                                 
                                    
                                    1.9%
                                 
                                                             | 
                                                        
                    |
| 14 | 28 | 
                                                                 
                                    
                                    1.8%
                                 
                                                             | 
                                                        
                    |
| 15 | 83 | 
                                                                 
                                    
                                    5.5%
                                 
                                                             | 
                                                        
                    |
| 16 | 22 | 
                                                                 
                                    
                                    1.4%
                                 
                                                             | 
                                                        
                    |
| 17 | 15 | 
                                                                 
                                    
                                    1%
                                 
                                                             | 
                                                        
                    |
| 18 | 35 | 
                                                                 
                                    
                                    2.3%
                                 
                                                             | 
                                                        
                    |
| 19 | 15 | 
                                                                 
                                    
                                    1%
                                 
                                                             | 
                                                        
                    |
| 20 | 138 | 
                                                                 
                                    
                                    9.1%
                                 
                                                             | 
                                                        
                    |
| 21 | 15 | 
                                                                 
                                    
                                    1%
                                 
                                                             | 
                                                        
                    |
| 22 | 21 | 
                                                                 
                                    
                                    1.4%
                                 
                                                             | 
                                                        
                    |
| 23 | 21 | 
                                                                 
                                    
                                    1.4%
                                 
                                                             | 
                                                        
                    |
| 24 | 14 | 
                                                                 
                                    
                                    0.9%
                                 
                                                             | 
                                                        
                    |
| 25 | 78 | 
                                                                 
                                    
                                    5.1%
                                 
                                                             | 
                                                        
                    |
| 26 | 6 | 
                                                                 
                                    
                                    0.4%
                                 
                                                             | 
                                                        
                    |
| 27 | 10 | 
                                                                 
                                    
                                    0.7%
                                 
                                                             | 
                                                        
                    |
| 28 | 13 | 
                                                                 
                                    
                                    0.9%
                                 
                                                             | 
                                                        
                    |
| 29 | 10 | 
                                                                 
                                    
                                    0.7%
                                 
                                                             | 
                                                        
                    |
| 30 | 83 | 
                                                                 
                                    
                                    5.5%
                                 
                                                             | 
                                                        
                    |
| 31 | 5 | 
                                                                 
                                    
                                    0.3%
                                 
                                                             | 
                                                        
                    |
| 32 | 5 | 
                                                                 
                                    
                                    0.3%
                                 
                                                             | 
                                                        
                    |
| 33 | 4 | 
                                                                 
                                    
                                    0.3%
                                 
                                                             | 
                                                        
                    |
| 34 | 3 | 
                                                                 
                                    
                                    0.2%
                                 
                                                             | 
                                                        
                    |
| 35 | 29 | 
                                                                 
                                    
                                    1.9%
                                 
                                                             | 
                                                        
                    |
| 36 | 3 | 
                                                                 
                                    
                                    0.2%
                                 
                                                             | 
                                                        
                    |
| 37 | 3 | 
                                                                 
                                    
                                    0.2%
                                 
                                                             | 
                                                        
                    |
| 38 | 7 | 
                                                                 
                                    
                                    0.5%
                                 
                                                             | 
                                                        
                    |
| 39 | 1 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    |
| 40 | 20 | 
                                                                 
                                    
                                    1.3%
                                 
                                                             | 
                                                        
                    |
| 41 | 2 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    |
| 43 | 3 | 
                                                                 
                                    
                                    0.2%
                                 
                                                             | 
                                                        
                    |
| 44 | 2 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    |
| 45 | 6 | 
                                                                 
                                    
                                    0.4%
                                 
                                                             | 
                                                        
                    |
| 46 | 1 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    |
| 47 | 2 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    |
| 49 | 1 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    |
| 50 | 10 | 
                                                                 
                                    
                                    0.7%
                                 
                                                             | 
                                                        
                    |
| 53 | 1 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    |
| 58 | 2 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             |