| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 11 | 
                                                                 
                                    
                                    8.6%
                                 
                                                             | 
                                                        
                    
| 20 | 1 | 
                                                                 
                                    
                                    0.8%
                                 
                                                             | 
                                                        
                    |
| 30 | 1 | 
                                                                 
                                    
                                    0.8%
                                 
                                                             | 
                                                        
                    |
| 40 | 6 | 
                                                                 
                                    
                                    4.7%
                                 
                                                             | 
                                                        
                    |
| 45 | 2 | 
                                                                 
                                    
                                    1.6%
                                 
                                                             | 
                                                        
                    |
| 50 | 7 | 
                                                                 
                                    
                                    5.5%
                                 
                                                             | 
                                                        
                    |
| 55 | 3 | 
                                                                 
                                    
                                    2.3%
                                 
                                                             | 
                                                        
                    |
| 60 | 10 | 
                                                                 
                                    
                                    7.8%
                                 
                                                             | 
                                                        
                    |
| 65 | 3 | 
                                                                 
                                    
                                    2.3%
                                 
                                                             | 
                                                        
                    |
| 66 | 1 | 
                                                                 
                                    
                                    0.8%
                                 
                                                             | 
                                                        
                    |
| 70 | 13 | 
                                                                 
                                    
                                    10.2%
                                 
                                                             | 
                                                        
                    |
| 75 | 13 | 
                                                                 
                                    
                                    10.2%
                                 
                                                             | 
                                                        
                    |
| 80 | 17 | 
                                                                 
                                    
                                    13.3%
                                 
                                                             | 
                                                        
                    |
| 82 | 1 | 
                                                                 
                                    
                                    0.8%
                                 
                                                             | 
                                                        
                    |
| 85 | 8 | 
                                                                 
                                    
                                    6.3%
                                 
                                                             | 
                                                        
                    |
| 90 | 12 | 
                                                                 
                                    
                                    9.4%
                                 
                                                             | 
                                                        
                    |
| 92 | 2 | 
                                                                 
                                    
                                    1.6%
                                 
                                                             | 
                                                        
                    |
| 95 | 7 | 
                                                                 
                                    
                                    5.5%
                                 
                                                             | 
                                                        
                    |
| 97 | 1 | 
                                                                 
                                    
                                    0.8%
                                 
                                                             | 
                                                        
                    |
| 98 | 1 | 
                                                                 
                                    
                                    0.8%
                                 
                                                             | 
                                                        
                    |
| 99 | 1 | 
                                                                 
                                    
                                    0.8%
                                 
                                                             | 
                                                        
                    |
| 100 | 7 | 
                                                                 
                                    
                                    5.5%
                                 
                                                             | 
                                                        
                    |
| Sysmiss | 481 |