| Value | Category | Cases | |
|---|---|---|---|
| 1 | less than 12 months | 501 | 
                                    
                                    25.2%
                                 | 
| 2 | 12-23 months | 207 | 
                                    
                                    10.4%
                                 | 
| 3 | 2 years or more | 1277 | 
                                    
                                    64.3%
                                 | 
| 9 | 1 | 
                                    
                                    0.1%
                                 | |
| 11 | .Z | 6253 |