| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 | 
                                    
                                    0.4%
                                 | 
| 0 | 199 | 
                                    
                                    70.3%
                                 | |
| 5 | 3 | 
                                    
                                    1.1%
                                 | |
| 10 | 6 | 
                                    
                                    2.1%
                                 | |
| 12 | 1 | 
                                    
                                    0.4%
                                 | |
| 16 | 1 | 
                                    
                                    0.4%
                                 | |
| 17 | 1 | 
                                    
                                    0.4%
                                 | |
| 20 | 8 | 
                                    
                                    2.8%
                                 | |
| 25 | 2 | 
                                    
                                    0.7%
                                 | |
| 26 | 1 | 
                                    
                                    0.4%
                                 | |
| 30 | 3 | 
                                    
                                    1.1%
                                 | |
| 34 | 1 | 
                                    
                                    0.4%
                                 | |
| 40 | 5 | 
                                    
                                    1.8%
                                 | |
| 50 | 14 | 
                                    
                                    4.9%
                                 | |
| 52 | 1 | 
                                    
                                    0.4%
                                 | |
| 60 | 7 | 
                                    
                                    2.5%
                                 | |
| 63 | 1 | 
                                    
                                    0.4%
                                 | |
| 65 | 1 | 
                                    
                                    0.4%
                                 | |
| 70 | 12 | 
                                    
                                    4.2%
                                 | |
| 75 | 2 | 
                                    
                                    0.7%
                                 | |
| 80 | 4 | 
                                    
                                    1.4%
                                 | |
| 90 | 3 | 
                                    
                                    1.1%
                                 | |
| 100 | 6 | 
                                    
                                    2.1%
                                 | |
| Sysmiss | 119 |