| Value | Category | Cases | |
|---|---|---|---|
| 1983 | 1 |
4%
|
|
| 1985 | 1 |
4%
|
|
| 1986 | 2 |
8%
|
|
| 1987 | 1 |
4%
|
|
| 1988 | 1 |
4%
|
|
| 1991 | 2 |
8%
|
|
| 1992 | 1 |
4%
|
|
| 1993 | 2 |
8%
|
|
| 1994 | 4 |
16%
|
|
| 1995 | 1 |
4%
|
|
| 1996 | 2 |
8%
|
|
| 1998 | 1 |
4%
|
|
| 1999 | 1 |
4%
|
|
| 2000 | 2 |
8%
|
|
| 2002 | 1 |
4%
|
|
| 2003 | 2 |
8%
|
|
| Sysmiss | 1772 |