| Value | Category | Cases | |
|---|---|---|---|
| 2000 | 1 |
5.6%
|
|
| 2004 | 1 |
5.6%
|
|
| 2007 | 1 |
5.6%
|
|
| 2008 | 15 |
83.3%
|
|
| Sysmiss | 4361 |