| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 11 | 
                                    
                                    6.8%
                                 | 
| 0 | 2 | 
                                    
                                    1.2%
                                 | |
| 2 | 1 | 
                                    
                                    0.6%
                                 | |
| 3 | 1 | 
                                    
                                    0.6%
                                 | |
| 4 | 2 | 
                                    
                                    1.2%
                                 | |
| 6 | 1 | 
                                    
                                    0.6%
                                 | |
| 7 | 2 | 
                                    
                                    1.2%
                                 | |
| 10 | 3 | 
                                    
                                    1.9%
                                 | |
| 11 | 1 | 
                                    
                                    0.6%
                                 | |
| 12 | 1 | 
                                    
                                    0.6%
                                 | |
| 14 | 1 | 
                                    
                                    0.6%
                                 | |
| 15 | 1 | 
                                    
                                    0.6%
                                 | |
| 20 | 3 | 
                                    
                                    1.9%
                                 | |
| 21 | 1 | 
                                    
                                    0.6%
                                 | |
| 25 | 3 | 
                                    
                                    1.9%
                                 | |
| 27 | 2 | 
                                    
                                    1.2%
                                 | |
| 28 | 1 | 
                                    
                                    0.6%
                                 | |
| 30 | 6 | 
                                    
                                    3.7%
                                 | |
| 32 | 1 | 
                                    
                                    0.6%
                                 | |
| 33 | 2 | 
                                    
                                    1.2%
                                 | |
| 35 | 1 | 
                                    
                                    0.6%
                                 | |
| 36 | 1 | 
                                    
                                    0.6%
                                 | |
| 37 | 1 | 
                                    
                                    0.6%
                                 | |
| 40 | 8 | 
                                    
                                    4.9%
                                 | |
| 48 | 2 | 
                                    
                                    1.2%
                                 | |
| 49 | 1 | 
                                    
                                    0.6%
                                 | |
| 50 | 10 | 
                                    
                                    6.2%
                                 | |
| 55 | 1 | 
                                    
                                    0.6%
                                 | |
| 59 | 1 | 
                                    
                                    0.6%
                                 | |
| 60 | 10 | 
                                    
                                    6.2%
                                 | |
| 65 | 2 | 
                                    
                                    1.2%
                                 | |
| 70 | 18 | 
                                    
                                    11.1%
                                 | |
| 72 | 1 | 
                                    
                                    0.6%
                                 | |
| 75 | 1 | 
                                    
                                    0.6%
                                 | |
| 80 | 11 | 
                                    
                                    6.8%
                                 | |
| 90 | 8 | 
                                    
                                    4.9%
                                 | |
| 94 | 2 | 
                                    
                                    1.2%
                                 | |
| 95 | 3 | 
                                    
                                    1.9%
                                 | |
| 98 | 2 | 
                                    
                                    1.2%
                                 | |
| 100 | 32 | 
                                    
                                    19.8%
                                 | |
| Sysmiss | 793 |