| Value | Category | Cases | |
|---|---|---|---|
| 1 | 1990-1959 | 14 |
8.5%
|
| 2 | 1960-1979 | 30 |
18.2%
|
| 3 | 1980-1989 | 59 |
35.8%
|
| 4 | After 1990 | 62 |
37.6%
|