| Value | Category | Cases | |
|---|---|---|---|
| 1980 | 1 |
12.5%
|
|
| 1984 | 1 |
12.5%
|
|
| 1994 | 1 |
12.5%
|
|
| 1995 | 2 |
25%
|
|
| 1996 | 1 |
12.5%
|
|
| 1997 | 1 |
12.5%
|
|
| 2002 | 1 |
12.5%
|
|
| Sysmiss | 276 |