| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 11 | 
                                    
                                    9.5%
                                 | 
| 1 | 9 | 
                                    
                                    7.8%
                                 | |
| 2 | 5 | 
                                    
                                    4.3%
                                 | |
| 3 | 7 | 
                                    
                                    6%
                                 | |
| 4 | 1 | 
                                    
                                    0.9%
                                 | |
| 5 | 11 | 
                                    
                                    9.5%
                                 | |
| 7 | 12 | 
                                    
                                    10.3%
                                 | |
| 8 | 2 | 
                                    
                                    1.7%
                                 | |
| 10 | 10 | 
                                    
                                    8.6%
                                 | |
| 14 | 16 | 
                                    
                                    13.8%
                                 | |
| 15 | 1 | 
                                    
                                    0.9%
                                 | |
| 20 | 2 | 
                                    
                                    1.7%
                                 | |
| 21 | 3 | 
                                    
                                    2.6%
                                 | |
| 25 | 2 | 
                                    
                                    1.7%
                                 | |
| 28 | 1 | 
                                    
                                    0.9%
                                 | |
| 30 | 15 | 
                                    
                                    12.9%
                                 | |
| 45 | 1 | 
                                    
                                    0.9%
                                 | |
| 60 | 5 | 
                                    
                                    4.3%
                                 | |
| 90 | 2 | 
                                    
                                    1.7%
                                 | |
| Sysmiss | 484 |