| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 22 | 
                                    
                                    7.9%
                                 | 
| 0 | 6 | 
                                    
                                    2.2%
                                 | |
| 1 | 17 | 
                                    
                                    6.1%
                                 | |
| 2 | 9 | 
                                    
                                    3.2%
                                 | |
| 3 | 7 | 
                                    
                                    2.5%
                                 | |
| 4 | 3 | 
                                    
                                    1.1%
                                 | |
| 5 | 5 | 
                                    
                                    1.8%
                                 | |
| 6 | 1 | 
                                    
                                    0.4%
                                 | |
| 7 | 2 | 
                                    
                                    0.7%
                                 | |
| 9 | 1 | 
                                    
                                    0.4%
                                 | |
| 10 | 9 | 
                                    
                                    3.2%
                                 | |
| 11 | 1 | 
                                    
                                    0.4%
                                 | |
| 13 | 2 | 
                                    
                                    0.7%
                                 | |
| 14 | 2 | 
                                    
                                    0.7%
                                 | |
| 15 | 8 | 
                                    
                                    2.9%
                                 | |
| 20 | 10 | 
                                    
                                    3.6%
                                 | |
| 22 | 1 | 
                                    
                                    0.4%
                                 | |
| 24 | 3 | 
                                    
                                    1.1%
                                 | |
| 25 | 8 | 
                                    
                                    2.9%
                                 | |
| 28 | 2 | 
                                    
                                    0.7%
                                 | |
| 30 | 9 | 
                                    
                                    3.2%
                                 | |
| 33 | 7 | 
                                    
                                    2.5%
                                 | |
| 35 | 3 | 
                                    
                                    1.1%
                                 | |
| 38 | 2 | 
                                    
                                    0.7%
                                 | |
| 39 | 1 | 
                                    
                                    0.4%
                                 | |
| 40 | 9 | 
                                    
                                    3.2%
                                 | |
| 44 | 1 | 
                                    
                                    0.4%
                                 | |
| 45 | 3 | 
                                    
                                    1.1%
                                 | |
| 46 | 1 | 
                                    
                                    0.4%
                                 | |
| 48 | 1 | 
                                    
                                    0.4%
                                 | |
| 49 | 3 | 
                                    
                                    1.1%
                                 | |
| 50 | 47 | 
                                    
                                    17%
                                 | |
| 51 | 3 | 
                                    
                                    1.1%
                                 | |
| 52 | 1 | 
                                    
                                    0.4%
                                 | |
| 55 | 1 | 
                                    
                                    0.4%
                                 | |
| 60 | 3 | 
                                    
                                    1.1%
                                 | |
| 70 | 2 | 
                                    
                                    0.7%
                                 | |
| 73 | 1 | 
                                    
                                    0.4%
                                 | |
| 75 | 4 | 
                                    
                                    1.4%
                                 | |
| 80 | 3 | 
                                    
                                    1.1%
                                 | |
| 85 | 1 | 
                                    
                                    0.4%
                                 | |
| 90 | 1 | 
                                    
                                    0.4%
                                 | |
| 93 | 1 | 
                                    
                                    0.4%
                                 | |
| 95 | 1 | 
                                    
                                    0.4%
                                 | |
| 99 | 1 | 
                                    
                                    0.4%
                                 | |
| 100 | 48 | 
                                    
                                    17.3%
                                 | |
| Sysmiss | 678 |