| Value | Category | Cases | |
|---|---|---|---|
| 1 | 1897-1939 | 723 |
13.6%
|
| 2 | 1940-1949 | 650 |
12.2%
|
| 3 | 1950-1959 | 887 |
16.7%
|
| 4 | 1960-1969 | 1042 |
19.6%
|
| 5 | 1970-1979 | 889 |
16.7%
|
| 6 | 1980-1988 | 1124 |
21.1%
|
| Sysmiss | 456 |