| Value | Category | Cases | |
|---|---|---|---|
| 1990 | 1 |
7.7%
|
|
| 2000 | 1 |
7.7%
|
|
| 2005 | 1 |
7.7%
|
|
| 2007 | 1 |
7.7%
|
|
| 2008 | 1 |
7.7%
|
|
| 2009 | 1 |
7.7%
|
|
| 2010 | 2 |
15.4%
|
|
| 2012 | 5 |
38.5%
|
|
| Sysmiss | 450 |