| Value | Category | Cases | |
|---|---|---|---|
| 2005 | 16 |
0.4%
|
|
| 2006 | 607 |
13.5%
|
|
| 2007 | 845 |
18.8%
|
|
| 2008 | 968 |
21.5%
|
|
| 2009 | 1099 |
24.4%
|
|
| 2010 | 952 |
21.1%
|
|
| 9997 | inconsistent | 15 |
0.3%
|
| 9998 | dk | 0 |
0%
|
| 10001 | .Z | 3730 |