| Value | Category | Cases | |
|---|---|---|---|
| 3 | 23 | 
                                    
                                    2.3%
                                 | |
| 4 | 71 | 
                                    
                                    7.1%
                                 | |
| 5 | 330 | 
                                    
                                    32.9%
                                 | |
| 6 | 238 | 
                                    
                                    23.8%
                                 | |
| 7 | 188 | 
                                    
                                    18.8%
                                 | |
| 8 | 85 | 
                                    
                                    8.5%
                                 | |
| 9 | 19 | 
                                    
                                    1.9%
                                 | |
| 11 | 29 | 
                                    
                                    2.9%
                                 | |
| 12 | 17 | 
                                    
                                    1.7%
                                 | |
| 88 | Don't know | 0 | 
                                    
                                    0%
                                 | 
| 99 | Missing | 2 | 
                                    
                                    0.2%
                                 |