| Value | Category | Cases | |
|---|---|---|---|
| 1 | Below 1990 | 436 |
2.5%
|
| 2 | 1990-1994 | 248 |
1.4%
|
| 3 | 1995-1999 | 1285 |
7.4%
|
| 4 | 2000-2004 | 1774 |
10.2%
|
| 5 | 2004-2009 | 6784 |
39.1%
|
| 6 | 2010 and above | 6792 |
39.2%
|
| 99 | Not stated | 26 |
0.1%
|