| Value | Category | Cases | |
|---|---|---|---|
| 2007 | 163 |
9.2%
|
|
| 2008 | 426 |
24%
|
|
| 2009 | 462 |
26%
|
|
| 2010 | 407 |
22.9%
|
|
| 2011 | 317 |
17.8%
|
|
| 2012 | 2 |
0.1%
|
|
| 9999 | Missing | 0 |
0%
|
| Sysmiss | 555 |