| Value | Category | Cases | |
|---|---|---|---|
| 1 | <1975 | 20 |
0.3%
|
| 2 | 1975-1980 | 75 |
1.2%
|
| 3 | 1981-985 | 64 |
1%
|
| 4 | 1986-1990 | 190 |
3%
|
| 5 | 1991-1995 | 374 |
5.8%
|
| 6 | 1996-2000 | 1203 |
18.8%
|
| 7 | 2001-2005 | 3330 |
51.9%
|
| 8 | 2006 | 998 |
15.6%
|
| 9 | 9999 | 161 |
2.5%
|