| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 31 | 
                                    
                                    8.5%
                                 | 
| 0 | 38 | 
                                    
                                    10.4%
                                 | |
| 1 | 53 | 
                                    
                                    14.6%
                                 | |
| 2 | 54 | 
                                    
                                    14.8%
                                 | |
| 3 | 30 | 
                                    
                                    8.2%
                                 | |
| 4 | 22 | 
                                    
                                    6%
                                 | |
| 5 | 12 | 
                                    
                                    3.3%
                                 | |
| 6 | 10 | 
                                    
                                    2.7%
                                 | |
| 7 | 13 | 
                                    
                                    3.6%
                                 | |
| 8 | 12 | 
                                    
                                    3.3%
                                 | |
| 9 | 4 | 
                                    
                                    1.1%
                                 | |
| 10 | 10 | 
                                    
                                    2.7%
                                 | |
| 11 | 2 | 
                                    
                                    0.5%
                                 | |
| 12 | 3 | 
                                    
                                    0.8%
                                 | |
| 13 | 4 | 
                                    
                                    1.1%
                                 | |
| 14 | 4 | 
                                    
                                    1.1%
                                 | |
| 15 | 4 | 
                                    
                                    1.1%
                                 | |
| 16 | 2 | 
                                    
                                    0.5%
                                 | |
| 18 | 2 | 
                                    
                                    0.5%
                                 | |
| 20 | 9 | 
                                    
                                    2.5%
                                 | |
| 22 | 1 | 
                                    
                                    0.3%
                                 | |
| 24 | 1 | 
                                    
                                    0.3%
                                 | |
| 25 | 2 | 
                                    
                                    0.5%
                                 | |
| 28 | 1 | 
                                    
                                    0.3%
                                 | |
| 30 | 8 | 
                                    
                                    2.2%
                                 | |
| 33 | 1 | 
                                    
                                    0.3%
                                 | |
| 40 | 4 | 
                                    
                                    1.1%
                                 | |
| 41 | 1 | 
                                    
                                    0.3%
                                 | |
| 44 | 1 | 
                                    
                                    0.3%
                                 | |
| 45 | 1 | 
                                    
                                    0.3%
                                 | |
| 46 | 1 | 
                                    
                                    0.3%
                                 | |
| 50 | 4 | 
                                    
                                    1.1%
                                 | |
| 55 | 2 | 
                                    
                                    0.5%
                                 | |
| 60 | 1 | 
                                    
                                    0.3%
                                 | |
| 65 | 3 | 
                                    
                                    0.8%
                                 | |
| 66 | 1 | 
                                    
                                    0.3%
                                 | |
| 67 | 1 | 
                                    
                                    0.3%
                                 | |
| 70 | 1 | 
                                    
                                    0.3%
                                 | |
| 71 | 1 | 
                                    
                                    0.3%
                                 | |
| 75 | 1 | 
                                    
                                    0.3%
                                 | |
| 100 | 2 | 
                                    
                                    0.5%
                                 | |
| 177 | 1 | 
                                    
                                    0.3%
                                 | |
| 200 | 2 | 
                                    
                                    0.5%
                                 | |
| 273 | 1 | 
                                    
                                    0.3%
                                 | |
| 300 | 1 | 
                                    
                                    0.3%
                                 | |
| 6286 | 1 | 
                                    
                                    0.3%
                                 | |
| Sysmiss | 591 |