| Value | Category | Cases | |
|---|---|---|---|
| 1 | 11 years old or younger | 76 | 
                                                                 
                                    
                                    2.2%
                                 
                                                             | 
                                                        
                    
| 2 | 12 years old | 321 | 
                                                                 
                                    
                                    9.3%
                                 
                                                             | 
                                                        
                    
| 3 | 13 years old | 580 | 
                                                                 
                                    
                                    16.8%
                                 
                                                             | 
                                                        
                    
| 4 | 14 years old | 740 | 
                                                                 
                                    
                                    21.5%
                                 
                                                             | 
                                                        
                    
| 5 | 15 years old | 748 | 
                                                                 
                                    
                                    21.7%
                                 
                                                             | 
                                                        
                    
| 6 | 16 years old | 587 | 
                                                                 
                                    
                                    17%
                                 
                                                             | 
                                                        
                    
| 7 | 17 years old or older | 395 | 
                                                                 
                                    
                                    11.5%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 11 |