| Value | Category | Cases | |
|---|---|---|---|
| 2008 | 7 |
0.1%
|
|
| 2009 | 916 |
12.1%
|
|
| 2010 | 1322 |
17.4%
|
|
| 2011 | 1616 |
21.3%
|
|
| 2012 | 1765 |
23.3%
|
|
| 2013 | 1883 |
24.8%
|
|
| 2014 | 78 |
1%
|
|
| 9997 | Inconsistent | 2 |
0%
|
| 9998 | Don't know | 0 |
0%
|
| Sysmiss | 41618 |