| Value | Category | Cases | |
|---|---|---|---|
| 2006 | 131 |
4.7%
|
|
| 2007 | 430 |
15.3%
|
|
| 2008 | 592 |
21.1%
|
|
| 2009 | 850 |
30.3%
|
|
| 2010 | 790 |
28.2%
|
|
| 9997 | inconsistent | 11 |
0.4%
|
| 9998 | dk | 0 |
0%
|
| 10001 | .Z | 15950 |