| Value | Category | Cases | |
|---|---|---|---|
| 2001 | 6 |
0.1%
|
|
| 2002 | 30 |
0.7%
|
|
| 2003 | 47 |
1.2%
|
|
| 2004 | 282 |
6.9%
|
|
| 2005 | 457 |
11.2%
|
|
| 2006 | 861 |
21.1%
|
|
| 2007 | 1399 |
34.3%
|
|
| 2008 | 1002 |
24.5%
|
|
| Sysmiss | 23906 |