| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 11 | 
                                                                 
                                    
                                    2%
                                 
                                                             | 
                                                        
                    
| -4 | Too many to count | 168 | 
                                                                 
                                    
                                    30.1%
                                 
                                                             | 
                                                        
                    
| 0 | 12 | 
                                                                 
                                    
                                    2.1%
                                 
                                                             | 
                                                        
                    |
| 1 | 17 | 
                                                                 
                                    
                                    3%
                                 
                                                             | 
                                                        
                    |
| 2 | 29 | 
                                                                 
                                    
                                    5.2%
                                 
                                                             | 
                                                        
                    |
| 3 | 44 | 
                                                                 
                                    
                                    7.9%
                                 
                                                             | 
                                                        
                    |
| 4 | 56 | 
                                                                 
                                    
                                    10%
                                 
                                                             | 
                                                        
                    |
| 5 | 51 | 
                                                                 
                                    
                                    9.1%
                                 
                                                             | 
                                                        
                    |
| 6 | 40 | 
                                                                 
                                    
                                    7.2%
                                 
                                                             | 
                                                        
                    |
| 7 | 13 | 
                                                                 
                                    
                                    2.3%
                                 
                                                             | 
                                                        
                    |
| 8 | 17 | 
                                                                 
                                    
                                    3%
                                 
                                                             | 
                                                        
                    |
| 9 | 6 | 
                                                                 
                                    
                                    1.1%
                                 
                                                             | 
                                                        
                    |
| 10 | 44 | 
                                                                 
                                    
                                    7.9%
                                 
                                                             | 
                                                        
                    |
| 12 | 15 | 
                                                                 
                                    
                                    2.7%
                                 
                                                             | 
                                                        
                    |
| 13 | 1 | 
                                                                 
                                    
                                    0.2%
                                 
                                                             | 
                                                        
                    |
| 14 | 2 | 
                                                                 
                                    
                                    0.4%
                                 
                                                             | 
                                                        
                    |
| 15 | 11 | 
                                                                 
                                    
                                    2%
                                 
                                                             | 
                                                        
                    |
| 16 | 1 | 
                                                                 
                                    
                                    0.2%
                                 
                                                             | 
                                                        
                    |
| 20 | 12 | 
                                                                 
                                    
                                    2.1%
                                 
                                                             | 
                                                        
                    |
| 25 | 1 | 
                                                                 
                                    
                                    0.2%
                                 
                                                             | 
                                                        
                    |
| 30 | 5 | 
                                                                 
                                    
                                    0.9%
                                 
                                                             | 
                                                        
                    |
| 40 | 1 | 
                                                                 
                                    
                                    0.2%
                                 
                                                             | 
                                                        
                    |
| 100 | 1 | 
                                                                 
                                    
                                    0.2%
                                 
                                                             | 
                                                        
                    |
| 200 | 1 | 
                                                                 
                                    
                                    0.2%
                                 
                                                             | 
                                                        
                    |
| Sysmiss | 50 |