| Value | Category | Cases | |
|---|---|---|---|
| 1 | By 18 months | 1443 |
91.3%
|
| 2 | By 2 years | 61 |
3.9%
|
| 3 | After 2 years | 18 |
1.1%
|
| 4 | Not yet | 9 |
0.6%
|
| 8 | Unknown | 50 |
3.2%
|