| Value | Category | Cases | |
|---|---|---|---|
| 2003 | 5 |
2.7%
|
|
| 2004 | 59 |
32.2%
|
|
| 2005 | 63 |
34.4%
|
|
| 2006 | 56 |
30.6%
|
|
| Sysmiss | 18283 |