| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 16 | 
                                    
                                    11.6%
                                 | 
| 0 | 8 | 
                                    
                                    5.8%
                                 | |
| 1 | 17 | 
                                    
                                    12.3%
                                 | |
| 2 | 13 | 
                                    
                                    9.4%
                                 | |
| 3 | 2 | 
                                    
                                    1.4%
                                 | |
| 4 | 2 | 
                                    
                                    1.4%
                                 | |
| 5 | 37 | 
                                    
                                    26.8%
                                 | |
| 6 | 1 | 
                                    
                                    0.7%
                                 | |
| 7 | 1 | 
                                    
                                    0.7%
                                 | |
| 10 | 20 | 
                                    
                                    14.5%
                                 | |
| 15 | 9 | 
                                    
                                    6.5%
                                 | |
| 20 | 8 | 
                                    
                                    5.8%
                                 | |
| 25 | 1 | 
                                    
                                    0.7%
                                 | |
| 60 | 1 | 
                                    
                                    0.7%
                                 | |
| 100 | 2 | 
                                    
                                    1.4%
                                 | |
| Sysmiss | 77 |