| Value | Category | Cases | |
|---|---|---|---|
| 1997 | 1 |
11.1%
|
|
| 2000 | 1 |
11.1%
|
|
| 2004 | 1 |
11.1%
|
|
| 2007 | 1 |
11.1%
|
|
| 2008 | 5 |
55.6%
|
|
| Sysmiss | 4370 |