| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 0 |
0%
|
| 2004 | 1 |
0%
|
|
| 2005 | 7 |
0.2%
|
|
| 2006 | 179 |
4.7%
|
|
| 2007 | 1100 |
29.1%
|
|
| 2008 | 1619 |
42.9%
|
|
| 2009 | 665 |
17.6%
|
|
| 2010 | 192 |
5.1%
|
|
| 2011 | 11 |
0.3%
|