| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than 2 years | 96 |
13.4%
|
| 2 | 2-4 years | 229 |
31.8%
|
| 3 | 5-7 years | 153 |
21.3%
|
| 4 | 8-10 years | 103 |
14.3%
|
| 5 | 11-13 years | 40 |
5.6%
|
| 6 | 14+ | 98 |
13.6%
|
| Sysmiss | 945 |