| Value | Category | Cases | |
|---|---|---|---|
| 1977 | 1 |
5.6%
|
|
| 1978 | 1 |
5.6%
|
|
| 1983 | 1 |
5.6%
|
|
| 1984 | 2 |
11.1%
|
|
| 1985 | 1 |
5.6%
|
|
| 1986 | 1 |
5.6%
|
|
| 1990 | 3 |
16.7%
|
|
| 1991 | 1 |
5.6%
|
|
| 1992 | 1 |
5.6%
|
|
| 1994 | 3 |
16.7%
|
|
| 1995 | 1 |
5.6%
|
|
| 1996 | 1 |
5.6%
|
|
| 1997 | 1 |
5.6%
|
|
| Sysmiss | 3704 |