| Value | Category | Cases | |
|---|---|---|---|
| 2005 | 21 |
0.5%
|
|
| 2006 | 365 |
9.3%
|
|
| 2007 | 586 |
14.9%
|
|
| 2008 | 860 |
21.8%
|
|
| 2009 | 1113 |
28.3%
|
|
| 2010 | 982 |
24.9%
|
|
| 9997 | inconsistent | 12 |
0.3%
|
| 9998 | dk | 0 |
0%
|
| 10001 | .Z | 14815 |