| Value | Category | Cases | |
|---|---|---|---|
| 2006 | 5 |
4.9%
|
|
| 2007 | 4 |
3.9%
|
|
| 2008 | 13 |
12.7%
|
|
| 2009 | 29 |
28.4%
|
|
| 2010 | 51 |
50%
|
|
| 9997 | inconsistent | 0 |
0%
|
| 9998 | dk | 0 |
0%
|
| 10001 | .Z | 15565 |