| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 3 | 
                                    
                                    4.2%
                                 | 
| 2 | 2 | 
                                    
                                    2.8%
                                 | |
| 5 | 1 | 
                                    
                                    1.4%
                                 | |
| 7 | 2 | 
                                    
                                    2.8%
                                 | |
| 8 | 1 | 
                                    
                                    1.4%
                                 | |
| 10 | 8 | 
                                    
                                    11.3%
                                 | |
| 11 | 1 | 
                                    
                                    1.4%
                                 | |
| 12 | 12 | 
                                    
                                    16.9%
                                 | |
| 13 | 2 | 
                                    
                                    2.8%
                                 | |
| 14 | 3 | 
                                    
                                    4.2%
                                 | |
| 15 | 8 | 
                                    
                                    11.3%
                                 | |
| 16 | 3 | 
                                    
                                    4.2%
                                 | |
| 17 | 2 | 
                                    
                                    2.8%
                                 | |
| 20 | 5 | 
                                    
                                    7%
                                 | |
| 25 | 8 | 
                                    
                                    11.3%
                                 | |
| 30 | 3 | 
                                    
                                    4.2%
                                 | |
| 35 | 7 | 
                                    
                                    9.9%
                                 | |
| Sysmiss | 927 |