| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 16 | 
                                    
                                    19%
                                 | 
| 0 | 4 | 
                                    
                                    4.8%
                                 | |
| 1 | 5 | 
                                    
                                    6%
                                 | |
| 2 | 3 | 
                                    
                                    3.6%
                                 | |
| 3 | 2 | 
                                    
                                    2.4%
                                 | |
| 4 | 1 | 
                                    
                                    1.2%
                                 | |
| 5 | 4 | 
                                    
                                    4.8%
                                 | |
| 7 | 3 | 
                                    
                                    3.6%
                                 | |
| 8 | 1 | 
                                    
                                    1.2%
                                 | |
| 10 | 13 | 
                                    
                                    15.5%
                                 | |
| 11 | 1 | 
                                    
                                    1.2%
                                 | |
| 12 | 2 | 
                                    
                                    2.4%
                                 | |
| 15 | 3 | 
                                    
                                    3.6%
                                 | |
| 18 | 3 | 
                                    
                                    3.6%
                                 | |
| 20 | 8 | 
                                    
                                    9.5%
                                 | |
| 21 | 1 | 
                                    
                                    1.2%
                                 | |
| 25 | 2 | 
                                    
                                    2.4%
                                 | |
| 28 | 1 | 
                                    
                                    1.2%
                                 | |
| 30 | 4 | 
                                    
                                    4.8%
                                 | |
| 40 | 2 | 
                                    
                                    2.4%
                                 | |
| 50 | 3 | 
                                    
                                    3.6%
                                 | |
| 63 | 1 | 
                                    
                                    1.2%
                                 | |
| 95 | 1 | 
                                    
                                    1.2%
                                 | |
| Sysmiss | 279 |