| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 3 | 
                                    
                                    2.9%
                                 | 
| 2 | 1 | 
                                    
                                    1%
                                 | |
| 3 | 1 | 
                                    
                                    1%
                                 | |
| 5 | 3 | 
                                    
                                    2.9%
                                 | |
| 7 | 13 | 
                                    
                                    12.6%
                                 | |
| 10 | 4 | 
                                    
                                    3.9%
                                 | |
| 14 | 11 | 
                                    
                                    10.7%
                                 | |
| 15 | 2 | 
                                    
                                    1.9%
                                 | |
| 20 | 4 | 
                                    
                                    3.9%
                                 | |
| 21 | 5 | 
                                    
                                    4.9%
                                 | |
| 30 | 25 | 
                                    
                                    24.3%
                                 | |
| 45 | 10 | 
                                    
                                    9.7%
                                 | |
| 50 | 1 | 
                                    
                                    1%
                                 | |
| 60 | 9 | 
                                    
                                    8.7%
                                 | |
| 90 | 8 | 
                                    
                                    7.8%
                                 | |
| 120 | 1 | 
                                    
                                    1%
                                 | |
| 210 | 1 | 
                                    
                                    1%
                                 | |
| 270 | 1 | 
                                    
                                    1%
                                 | |
| Sysmiss | 299 |