| Value | Category | Cases | |
|---|---|---|---|
| 2006 | 1 |
0.5%
|
|
| 2007 | 5 |
2.6%
|
|
| 2008 | 8 |
4.2%
|
|
| 2009 | 24 |
12.6%
|
|
| 2010 | 62 |
32.5%
|
|
| 2011 | 70 |
36.6%
|
|
| 9997 | Inconsistent (Secondary Editing) | 1 |
0.5%
|
| 9999 | Missing | 20 |
10.5%
|
| Sysmiss | 4581 |