| Value | Category | Cases | |
|---|---|---|---|
| 1 | < 1950 | 3605 |
6.5%
|
| 2 | 1950-1959 | 2827 |
5.1%
|
| 3 | 1960-1969 | 6324 |
11.5%
|
| 4 | 1970-1979 | 12006 |
21.8%
|
| 5 | 1980-1989 | 21733 |
39.5%
|
| 6 | > 1990 | 8550 |
15.5%
|