| Value | Category | Cases | |
|---|---|---|---|
| 2003 | 14 |
0.1%
|
|
| 2004 | 28 |
0.3%
|
|
| 2005 | 40 |
0.4%
|
|
| 2006 | 111 |
1.1%
|
|
| 2007 | 290 |
2.8%
|
|
| 2008 | 5027 |
48.9%
|
|
| 2009 | 4761 |
46.4%
|
|
| Sysmiss | 18614 |