| Value | Category | Cases | |
|---|---|---|---|
| 1982 | 2 |
20%
|
|
| 1983 | 1 |
10%
|
|
| 1984 | 2 |
20%
|
|
| 1985 | 2 |
20%
|
|
| 1986 | 1 |
10%
|
|
| 1987 | 1 |
10%
|
|
| 1988 | 1 |
10%
|
|
| Sysmiss | 89 |