| Value | Category | Cases | |
|---|---|---|---|
| 1 | Within the last 12 months | 1079 | 
                                    
                                    4.2%
                                 | 
| 2 | 1 - 2 years ago | 975 | 
                                    
                                    3.8%
                                 | 
| 3 | 2 - 3 years ago | 973 | 
                                    
                                    3.8%
                                 | 
| 4 | More than 3 years ago | 2797 | 
                                    
                                    10.9%
                                 | 
| 5 | Never | 19760 | 
                                    
                                    77.2%
                                 |