| Value | Category | Cases | |
|---|---|---|---|
| 2000 | 1 |
0.3%
|
|
| 2001 | 1 |
0.3%
|
|
| 2005 | 1 |
0.3%
|
|
| 2007 | 2 |
0.5%
|
|
| 2008 | 201 |
54.3%
|
|
| 2009 | 164 |
44.3%
|
|
| Sysmiss | 115 |