| Value | Category | Cases | |
|---|---|---|---|
| 2006 | 11 |
31.4%
|
|
| 2007 | 13 |
37.1%
|
|
| 2008 | 7 |
20%
|
|
| 2009 | 3 |
8.6%
|
|
| 2010 | 1 |
2.9%
|
|
| 9997 | inconsistent | 0 |
0%
|
| 9998 | dk | 0 |
0%
|
| 10001 | .Z | 18719 |