| Value | Category | Cases | |
|---|---|---|---|
| 1 | Before 2003 | 7447 |
86.7%
|
| 2 | Between 2003 and 2014 | 580 |
6.7%
|
| 3 | After 2014 | 567 |
6.6%
|
| Sysmiss | 21 |