| Value | Category | Cases | |
|---|---|---|---|
| 2005 | 2 |
0.4%
|
|
| 2006 | 93 |
18%
|
|
| 2007 | 275 |
53.1%
|
|
| 2008 | 148 |
28.6%
|
|
| Sysmiss | 104 |