| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than 2 years | 166 |
10.6%
|
| 2 | 2-5 years | 281 |
17.9%
|
| 3 | 6-10 years | 339 |
21.6%
|
| 4 | 11-20 years | 413 |
26.3%
|
| 5 | 21-50 years | 359 |
22.9%
|
| 6 | More than 50 years | 10 |
0.6%
|
| Sysmiss | 11 |