| Value | Category | Cases | Weighted | |
|---|---|---|---|---|
| 1974 | 3 | 4 |
32.4%
|
|
| 1977 | 1 | 2 |
16.1%
|
|
| 1979 | 1 | 1 |
11%
|
|
| 1980 | 1 | 0 |
2.1%
|
|
| 1981 | 3 | 3 |
29.8%
|
|
| 1982 | 2 | 0 |
4.3%
|
|
| 1984 | 1 | 0 |
2.1%
|
|
| 1987 | 1 | 0 |
2.1%
|
|
| Sysmiss | 3280 | 3282 |