| Value | Category | Cases | |
|---|---|---|---|
| 2005 | 4 |
0.1%
|
|
| 2006 | 518 |
12.4%
|
|
| 2007 | 817 |
19.6%
|
|
| 2008 | 892 |
21.4%
|
|
| 2009 | 1044 |
25%
|
|
| 2010 | 884 |
21.2%
|
|
| 9997 | inconsistent | 18 |
0.4%
|
| 9998 | dk | 0 |
0%
|
| 10001 | .Z | 4055 |