| Value | Category | Cases | |
|---|---|---|---|
| 2005 | 1 |
0%
|
|
| 2006 | 91 |
4%
|
|
| 2007 | 162 |
7.2%
|
|
| 2008 | 335 |
14.8%
|
|
| 2009 | 590 |
26.1%
|
|
| 2010 | 1075 |
47.5%
|
|
| 9997 | inconsistent | 9 |
0.4%
|
| 9998 | dk | 0 |
0%
|
| 10001 | .Z | 5969 |