| Value | Category | Cases | |
|---|---|---|---|
| 2001 | 5 |
0.6%
|
|
| 2002 | 47 |
5.2%
|
|
| 2003 | 100 |
11.1%
|
|
| 2004 | 117 |
13%
|
|
| 2005 | 217 |
24.1%
|
|
| 2006 | 284 |
31.5%
|
|
| 2007 | 131 |
14.5%
|
|
| Sysmiss | 24099 |