| Value | Category | Cases | |
|---|---|---|---|
| 1995 | 1 |
6.3%
|
|
| 2000 | 1 |
6.3%
|
|
| 2004 | 7 |
43.8%
|
|
| 2005 | 3 |
18.8%
|
|
| 2006 | 4 |
25%
|
|
| Sysmiss | 18450 |