| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 0 | 
                                    
                                    0%
                                 | 
| -9 | Don't know (spontaneous) | 0 | 
                                    
                                    0%
                                 | 
| 0 | 10 | 
                                    
                                    5.2%
                                 | |
| 10 | 1 | 
                                    
                                    0.5%
                                 | |
| 15 | 1 | 
                                    
                                    0.5%
                                 | |
| 20 | 1 | 
                                    
                                    0.5%
                                 | |
| 30 | 1 | 
                                    
                                    0.5%
                                 | |
| 40 | 2 | 
                                    
                                    1%
                                 | |
| 50 | 1 | 
                                    
                                    0.5%
                                 | |
| 60 | 4 | 
                                    
                                    2.1%
                                 | |
| 70 | 2 | 
                                    
                                    1%
                                 | |
| 80 | 2 | 
                                    
                                    1%
                                 | |
| 90 | 2 | 
                                    
                                    1%
                                 | |
| 95 | 3 | 
                                    
                                    1.6%
                                 | |
| 98 | 1 | 
                                    
                                    0.5%
                                 | |
| 100 | 162 | 
                                    
                                    83.9%
                                 | |
| Sysmiss | 49 |