| Value | Category | Cases | |
|---|---|---|---|
| 2009 | 34 |
14%
|
|
| 2010 | 56 |
23.1%
|
|
| 2011 | 92 |
38%
|
|
| 2012 | 51 |
21.1%
|
|
| 9998 | don't know | 0 |
0%
|
| 9999995 | missing:impute | 9 |
3.7%
|