| Value | Category | Cases | |
|---|---|---|---|
| 2006 | 1 |
0.4%
|
|
| 2007 | 7 |
2.7%
|
|
| 2008 | 5 |
1.9%
|
|
| 2009 | 39 |
15.1%
|
|
| 2010 | 78 |
30.2%
|
|
| 2011 | 62 |
24%
|
|
| 9997 | Inconsistent (Secondary Editing) | 1 |
0.4%
|
| 9999 | Missing | 65 |
25.2%
|
| Sysmiss | 4569 |