| Value | Category | Cases | |
|---|---|---|---|
| 1994 | 1 |
12.5%
|
|
| 1998 | 1 |
12.5%
|
|
| 2004 | 1 |
12.5%
|
|
| 2005 | 2 |
25%
|
|
| 2006 | 2 |
25%
|
|
| 2008 | 1 |
12.5%
|
|
| Sysmiss | 300 |