| Value | Category | Cases | |
|---|---|---|---|
| 2009 | 136 |
5.1%
|
|
| 2010 | 549 |
20.4%
|
|
| 2011 | 549 |
20.4%
|
|
| 2012 | 566 |
21%
|
|
| 2013 | 539 |
20%
|
|
| 2014 | 354 |
13.1%
|
|
| 9997 | Inconsistent | 0 |
0%
|
| 9999 | Missing | 0 |
0%
|
| Sysmiss | 35 |