| Value | Category | Cases | |
|---|---|---|---|
| 1 | before 1945 | 113 |
6.3%
|
| 2 | 1945-1960 | 179 |
10.1%
|
| 3 | 1961-1980 | 606 |
34%
|
| 4 | 1981-1990 | 426 |
23.9%
|
| 5 | after 1990 | 456 |
25.6%
|
| Sysmiss | 375 |