| Value | Category | Cases | |
|---|---|---|---|
| 2004 | 1 |
0.1%
|
|
| 2005 | 1 |
0.1%
|
|
| 2007 | 127 |
9.5%
|
|
| 2008 | 1202 |
90.3%
|
|
| Sysmiss | 32 |