| Value | Category | Cases | |
|---|---|---|---|
| 2006 | 1 |
0.6%
|
|
| 2007 | 3 |
1.8%
|
|
| 2008 | 10 |
6.1%
|
|
| 2009 | 12 |
7.3%
|
|
| 2010 | 49 |
29.9%
|
|
| 2011 | 70 |
42.7%
|
|
| 9997 | Inconsistent (Secondary Editing) | 1 |
0.6%
|
| 9999 | Missing | 18 |
11%
|
| Sysmiss | 4608 |