| Value | Category | Cases | |
|---|---|---|---|
| 2001 | 1 |
0.1%
|
|
| 2007 | 1 |
0.1%
|
|
| 2008 | 16 |
1.1%
|
|
| 2009 | 846 |
57.7%
|
|
| 2010 | 603 |
41.1%
|
|
| Sysmiss | 1738 |