| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 35 | 
                                    
                                    9.6%
                                 | 
| -8 | Refusal (spontaneous) | 18 | 
                                    
                                    4.9%
                                 | 
| 0 | 20 | 
                                    
                                    5.5%
                                 | |
| 2 | 2 | 
                                    
                                    0.5%
                                 | |
| 4 | 1 | 
                                    
                                    0.3%
                                 | |
| 5 | 2 | 
                                    
                                    0.5%
                                 | |
| 6 | 33 | 
                                    
                                    9.1%
                                 | |
| 7 | 8 | 
                                    
                                    2.2%
                                 | |
| 8 | 1 | 
                                    
                                    0.3%
                                 | |
| 9 | 1 | 
                                    
                                    0.3%
                                 | |
| 10 | 6 | 
                                    
                                    1.6%
                                 | |
| 11 | 2 | 
                                    
                                    0.5%
                                 | |
| 12 | 44 | 
                                    
                                    12.1%
                                 | |
| 13 | 28 | 
                                    
                                    7.7%
                                 | |
| 14 | 30 | 
                                    
                                    8.2%
                                 | |
| 15 | 12 | 
                                    
                                    3.3%
                                 | |
| 16 | 5 | 
                                    
                                    1.4%
                                 | |
| 17 | 2 | 
                                    
                                    0.5%
                                 | |
| 18 | 55 | 
                                    
                                    15.1%
                                 | |
| 19 | 1 | 
                                    
                                    0.3%
                                 | |
| 20 | 11 | 
                                    
                                    3%
                                 | |
| 22 | 5 | 
                                    
                                    1.4%
                                 | |
| 23 | 4 | 
                                    
                                    1.1%
                                 | |
| 24 | 1 | 
                                    
                                    0.3%
                                 | |
| 25 | 8 | 
                                    
                                    2.2%
                                 | |
| 26 | 3 | 
                                    
                                    0.8%
                                 | |
| 28 | 3 | 
                                    
                                    0.8%
                                 | |
| 29 | 2 | 
                                    
                                    0.5%
                                 | |
| 30 | 8 | 
                                    
                                    2.2%
                                 | |
| 32 | 1 | 
                                    
                                    0.3%
                                 | |
| 35 | 4 | 
                                    
                                    1.1%
                                 | |
| 36 | 1 | 
                                    
                                    0.3%
                                 | |
| 40 | 1 | 
                                    
                                    0.3%
                                 | |
| 42 | 2 | 
                                    
                                    0.5%
                                 | |
| 44 | 1 | 
                                    
                                    0.3%
                                 | |
| 50 | 1 | 
                                    
                                    0.3%
                                 | |
| 60 | 2 | 
                                    
                                    0.5%
                                 |