| Value | Category | Cases | |
|---|---|---|---|
| 1995 | 1 |
0.2%
|
|
| 2004 | 1 |
0.2%
|
|
| 2006 | 1 |
0.2%
|
|
| 2007 | 2 |
0.4%
|
|
| 2008 | 7 |
1.5%
|
|
| 2009 | 233 |
50.8%
|
|
| 2010 | 183 |
39.9%
|
|
| 2011 | 5 |
1.1%
|
|
| 2012 | 26 |
5.7%
|
|
| Sysmiss | 4 |