| Value | Category | Cases | |
|---|---|---|---|
| 2000 | 1981-2004 | 19 |
11.4%
|
| 2005 | 47 |
28.1%
|
|
| 2006 | 44 |
26.3%
|
|
| 2007 | 43 |
25.7%
|
|
| 2008 | 14 |
8.4%
|
|
| Sysmiss | 9142 |