| Value | Category | Cases | |
|---|---|---|---|
| 2006 | 18 |
45%
|
|
| 2007 | 18 |
45%
|
|
| 2008 | 1 |
2.5%
|
|
| 2010 | 2 |
5%
|
|
| 9997 | inconsistent | 1 |
2.5%
|
| 9998 | dk | 0 |
0%
|
| 10001 | .Z | 18714 |