| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 4 | 
                                    
                                    1.3%
                                 | 
| 1 | 59 | 
                                    
                                    18.6%
                                 | |
| 2 | 86 | 
                                    
                                    27.1%
                                 | |
| 3 | 50 | 
                                    
                                    15.8%
                                 | |
| 4 | 32 | 
                                    
                                    10.1%
                                 | |
| 5 | 34 | 
                                    
                                    10.7%
                                 | |
| 6 | 13 | 
                                    
                                    4.1%
                                 | |
| 8 | 6 | 
                                    
                                    1.9%
                                 | |
| 9 | 1 | 
                                    
                                    0.3%
                                 | |
| 10 | 16 | 
                                    
                                    5%
                                 | |
| 12 | 11 | 
                                    
                                    3.5%
                                 | |
| 14 | 1 | 
                                    
                                    0.3%
                                 | |
| 15 | 1 | 
                                    
                                    0.3%
                                 | |
| 20 | 3 | 
                                    
                                    0.9%
                                 | |
| Sysmiss | 47 |