| Value | Category | Cases | |
|---|---|---|---|
| 2006 | 4 |
0.6%
|
|
| 2007 | 125 |
20.2%
|
|
| 2008 | 130 |
21%
|
|
| 2009 | 115 |
18.6%
|
|
| 2010 | 136 |
22%
|
|
| 2011 | 108 |
17.4%
|
|
| 2012 | 1 |
0.2%
|
|
| 9997 | Inconsistent | 0 |
0%
|
| Sysmiss | 9 |