| Value | Category | Cases | |
|---|---|---|---|
| 1 | 2008-2012 | 355 |
40%
|
| 2 | 2003-2007 | 258 |
29.1%
|
| 3 | 1998-2002 | 84 |
9.5%
|
| 4 | 1993-1997 | 56 |
6.3%
|
| 5 | 1988-1992 | 42 |
4.7%
|
| 6 | 1983-1987 | 39 |
4.4%
|
| 7 | Below 1983 | 29 |
3.3%
|
| 9 | Not specified | 24 |
2.7%
|
| Sysmiss | 3125 |