| Value | Category | Cases | |
|---|---|---|---|
| 1994 | 1 |
0.6%
|
|
| 1999 | 1 |
0.6%
|
|
| 2004 | 2 |
1.3%
|
|
| 2005 | 4 |
2.5%
|
|
| 2006 | 38 |
23.9%
|
|
| 2007 | 22 |
13.8%
|
|
| 2008 | 44 |
27.7%
|
|
| 2009 | 38 |
23.9%
|
|
| 2010 | 6 |
3.8%
|
|
| 2011 | 2 |
1.3%
|
|
| 9999 | 1 |
0.6%
|
|
| Sysmiss | 302 |