| Value | Category | Cases | |
|---|---|---|---|
| 1 | Before 1970 | 5374 |
17.8%
|
| 2 | 1970 -1979 | 3499 |
11.6%
|
| 3 | 1980 -1989 | 5563 |
18.4%
|
| 4 | 1990 -1995 | 4777 |
15.8%
|
| 5 | 1996 | 876 |
2.9%
|
| 6 | 1997 | 782 |
2.6%
|
| 7 | 1998 | 1009 |
3.3%
|
| 8 | 1999 | 992 |
3.3%
|
| 9 | 2000 | 1102 |
3.6%
|
| 10 | 2001 | 323 |
1.1%
|
| 11 | Don't Know | 5965 |
19.7%
|