| Value | Category | Cases | |
|---|---|---|---|
| 2005 | 5 |
0.7%
|
|
| 2006 | 268 |
35%
|
|
| 2007 | 269 |
35.2%
|
|
| 2008 | 167 |
21.8%
|
|
| 2009 | 44 |
5.8%
|
|
| 2010 | 9 |
1.2%
|
|
| 9997 | inconsistent | 3 |
0.4%
|
| 9998 | dk | 0 |
0%
|
| 10001 | .Z | 17989 |