| Value | Category | Cases | |
|---|---|---|---|
| 2009 | 59 |
2.4%
|
|
| 2010 | 276 |
11.4%
|
|
| 2011 | 883 |
36.5%
|
|
| 2012 | 415 |
17.1%
|
|
| 2013 | 783 |
32.3%
|
|
| 9997 | Inconsistent | 6 |
0.2%
|
| 9998 | Don't know | 0 |
0%
|
| Sysmiss | 46785 |