| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 42 | 
                                    
                                    6.5%
                                 | 
| 5 | 1 | 
                                    
                                    0.2%
                                 | |
| 20 | 3 | 
                                    
                                    0.5%
                                 | |
| 25 | 1 | 
                                    
                                    0.2%
                                 | |
| 30 | 3 | 
                                    
                                    0.5%
                                 | |
| 35 | 1 | 
                                    
                                    0.2%
                                 | |
| 40 | 9 | 
                                    
                                    1.4%
                                 | |
| 45 | 2 | 
                                    
                                    0.3%
                                 | |
| 50 | 9 | 
                                    
                                    1.4%
                                 | |
| 55 | 1 | 
                                    
                                    0.2%
                                 | |
| 57 | 1 | 
                                    
                                    0.2%
                                 | |
| 60 | 27 | 
                                    
                                    4.2%
                                 | |
| 65 | 8 | 
                                    
                                    1.2%
                                 | |
| 68 | 1 | 
                                    
                                    0.2%
                                 | |
| 70 | 31 | 
                                    
                                    4.8%
                                 | |
| 75 | 11 | 
                                    
                                    1.7%
                                 | |
| 78 | 1 | 
                                    
                                    0.2%
                                 | |
| 80 | 38 | 
                                    
                                    5.9%
                                 | |
| 85 | 3 | 
                                    
                                    0.5%
                                 | |
| 90 | 25 | 
                                    
                                    3.9%
                                 | |
| 92 | 1 | 
                                    
                                    0.2%
                                 | |
| 95 | 4 | 
                                    
                                    0.6%
                                 | |
| 99 | 1 | 
                                    
                                    0.2%
                                 | |
| 100 | 419 | 
                                    
                                    65.2%
                                 | |
| Sysmiss | 773 |