| Value | Category | Cases | |
|---|---|---|---|
| 1 | Present all year | 6176 |
89.2%
|
| 2 | Absent 6 months or less | 661 |
9.5%
|
| 3 | Absent more than 6 months | 89 |
1.3%
|
| Sysmiss | 2974 |