| Value | Category | Cases | |
|---|---|---|---|
| 1 | Within the last 12 months | 405 | 
                                    
                                    1.6%
                                 | 
| 2 | 1 - 2 years ago | 351 | 
                                    
                                    1.4%
                                 | 
| 3 | 2 - 3 years ago | 489 | 
                                    
                                    1.9%
                                 | 
| 4 | More than 3 years ago | 1720 | 
                                    
                                    6.7%
                                 | 
| 5 | Never | 22619 | 
                                    
                                    88.4%
                                 |