| Value | Category | Cases | |
|---|---|---|---|
| 1999 | 1 |
1.7%
|
|
| 2000 | 5 |
8.6%
|
|
| 2002 | 2 |
3.4%
|
|
| 2003 | 1 |
1.7%
|
|
| 2006 | 2 |
3.4%
|
|
| 2007 | 15 |
25.9%
|
|
| 2008 | 11 |
19%
|
|
| 2009 | 7 |
12.1%
|
|
| 2010 | 8 |
13.8%
|
|
| 2012 | 6 |
10.3%
|
|
| Sysmiss | 405 |