| Value | Category | Cases | |
|---|---|---|---|
| 1986 | 1 |
16.7%
|
|
| 1996 | 1 |
16.7%
|
|
| 2002 | 1 |
16.7%
|
|
| 2003 | 2 |
33.3%
|
|
| 2004 | 1 |
16.7%
|
|
| Sysmiss | 1791 |