| Value | Category | Cases | |
|---|---|---|---|
| 1990 | 1 |
5.9%
|
|
| 2005 | 1 |
5.9%
|
|
| 2006 | 1 |
5.9%
|
|
| 2007 | 1 |
5.9%
|
|
| 2008 | 5 |
29.4%
|
|
| 2009 | 3 |
17.6%
|
|
| 2010 | 3 |
17.6%
|
|
| 2011 | 2 |
11.8%
|
|
| Sysmiss | 444 |