| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 9 | 
                                    
                                    19.1%
                                 | 
| 1 | 7 | 
                                    
                                    14.9%
                                 | |
| 2 | 2 | 
                                    
                                    4.3%
                                 | |
| 3 | 1 | 
                                    
                                    2.1%
                                 | |
| 4 | 1 | 
                                    
                                    2.1%
                                 | |
| 5 | 8 | 
                                    
                                    17%
                                 | |
| 8 | 1 | 
                                    
                                    2.1%
                                 | |
| 10 | 1 | 
                                    
                                    2.1%
                                 | |
| 12 | 1 | 
                                    
                                    2.1%
                                 | |
| 15 | 3 | 
                                    
                                    6.4%
                                 | |
| 20 | 4 | 
                                    
                                    8.5%
                                 | |
| 25 | 2 | 
                                    
                                    4.3%
                                 | |
| 30 | 3 | 
                                    
                                    6.4%
                                 | |
| 37 | 1 | 
                                    
                                    2.1%
                                 | |
| 40 | 2 | 
                                    
                                    4.3%
                                 | |
| 50 | 1 | 
                                    
                                    2.1%
                                 | |
| Sysmiss | 1369 |