| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 101 | 
                                    
                                    27.7%
                                 | 
| 1 | 69 | 
                                    
                                    18.9%
                                 | |
| 2 | 73 | 
                                    
                                    20%
                                 | |
| 3 | 34 | 
                                    
                                    9.3%
                                 | |
| 4 | 5 | 
                                    
                                    1.4%
                                 | |
| 5 | 19 | 
                                    
                                    5.2%
                                 | |
| 6 | 2 | 
                                    
                                    0.5%
                                 | |
| 8 | 6 | 
                                    
                                    1.6%
                                 | |
| 10 | 25 | 
                                    
                                    6.8%
                                 | |
| 12 | 1 | 
                                    
                                    0.3%
                                 | |
| 15 | 18 | 
                                    
                                    4.9%
                                 | |
| 20 | 5 | 
                                    
                                    1.4%
                                 | |
| 30 | 3 | 
                                    
                                    0.8%
                                 | |
| 40 | 1 | 
                                    
                                    0.3%
                                 | |
| 80 | 1 | 
                                    
                                    0.3%
                                 | |
| 95 | 1 | 
                                    
                                    0.3%
                                 | |
| 100 | 1 | 
                                    
                                    0.3%
                                 | |
| Sysmiss | 280 |