| Value | Category | Cases | |
|---|---|---|---|
| 2005 | 4 |
0.1%
|
|
| 2006 | 521 |
12.4%
|
|
| 2007 | 818 |
19.5%
|
|
| 2008 | 896 |
21.4%
|
|
| 2009 | 1046 |
25%
|
|
| 2010 | 890 |
21.2%
|
|
| 9997 | inconsistent | 17 |
0.4%
|
| 9998 | dk | 0 |
0%
|
| 10001 | .Z | 4040 |