| Value | Category | Cases | |
|---|---|---|---|
| 2005 | 6 |
0.7%
|
|
| 2006 | 24 |
2.8%
|
|
| 2007 | 61 |
7%
|
|
| 2008 | 229 |
26.3%
|
|
| 2009 | 287 |
33%
|
|
| 2010 | 263 |
30.2%
|
|
| 9997 | inconsistent | 0 |
0%
|
| 9998 | dk | 0 |
0%
|
| 10001 | .Z | 14797 |