| Value | Category | Cases | |
|---|---|---|---|
| 1984 | 1 |
12.5%
|
|
| 1985 | 1 |
12.5%
|
|
| 1991 | 1 |
12.5%
|
|
| 1996 | 2 |
25%
|
|
| 1998 | 1 |
12.5%
|
|
| 1999 | 1 |
12.5%
|
|
| 2001 | 1 |
12.5%
|
|
| Sysmiss | 1774 |