| Value | Category | Cases | |
|---|---|---|---|
| 2005 | 1 |
0.2%
|
|
| 2006 | 36 |
7.6%
|
|
| 2007 | 69 |
14.6%
|
|
| 2008 | 86 |
18.3%
|
|
| 2009 | 102 |
21.7%
|
|
| 2010 | 175 |
37.2%
|
|
| 9997 | inconsistent | 2 |
0.4%
|
| 9998 | dk | 0 |
0%
|
| 10001 | .Z | 18283 |