| Value | Category | Cases | |
|---|---|---|---|
| 1990 | 1 |
2.1%
|
|
| 1992 | 1 |
2.1%
|
|
| 1994 | 1 |
2.1%
|
|
| 1998 | 1 |
2.1%
|
|
| 2000 | 6 |
12.5%
|
|
| 2002 | 1 |
2.1%
|
|
| 2005 | 3 |
6.3%
|
|
| 2006 | 4 |
8.3%
|
|
| 2007 | 5 |
10.4%
|
|
| 2008 | 6 |
12.5%
|
|
| 2009 | 14 |
29.2%
|
|
| 2010 | 4 |
8.3%
|
|
| 2011 | 1 |
2.1%
|
|
| Sysmiss | 413 |