| Value | Category | Cases | |
|---|---|---|---|
| 1995 | 1 |
0.6%
|
|
| 1997 | 1 |
0.6%
|
|
| 1999 | 1 |
0.6%
|
|
| 2002 | 4 |
2.6%
|
|
| 2003 | 4 |
2.6%
|
|
| 2004 | 16 |
10.4%
|
|
| 2005 | 12 |
7.8%
|
|
| 2006 | 55 |
35.7%
|
|
| 2007 | 43 |
27.9%
|
|
| 2008 | 13 |
8.4%
|
|
| 2009 | 4 |
2.6%
|
|
| Sysmiss | 277 |