| Value | Category | Cases | |
|---|---|---|---|
| 1 | 11 years old or younger | 13 | 
                                    
                                    0.4%
                                 | 
| 2 | 12 years old | 17 | 
                                    
                                    0.5%
                                 | 
| 3 | 13 years old | 221 | 
                                    
                                    6.7%
                                 | 
| 4 | 14 years old | 1233 | 
                                    
                                    37.5%
                                 | 
| 5 | 15 years old | 957 | 
                                    
                                    29.1%
                                 | 
| 6 | 16 years old | 831 | 
                                    
                                    25.2%
                                 | 
| 7 | 17 years old or older | 20 | 
                                    
                                    0.6%
                                 | 
| Sysmiss | 21 |