| 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 |