| Value | Category | Cases | |
|---|---|---|---|
| 2007 | 4 |
1.6%
|
|
| 2008 | 107 |
43.7%
|
|
| 2009 | 109 |
44.5%
|
|
| 2010 | 8 |
3.3%
|
|
| 9998 | 9998. Don't know | 17 |
6.9%
|
| 9999 | 9999. Missing | 0 |
0%
|