| Value | Category | Cases | |
|---|---|---|---|
| 1997 | 1 |
11.1%
|
|
| 2004 | 1 |
11.1%
|
|
| 2005 | 1 |
11.1%
|
|
| 2006 | 1 |
11.1%
|
|
| 2007 | 1 |
11.1%
|
|
| 2008 | 2 |
22.2%
|
|
| 2009 | 2 |
22.2%
|
|
| Sysmiss | 342 |