| Value | Category | Cases | Weighted | |
|---|---|---|---|---|
| 2007 | 2 | 2 |
0.8%
|
|
| 2008 | 5 | 5 |
2.1%
|
|
| 2009 | 25 | 25 |
11%
|
|
| 2010 | 76 | 76 |
33.3%
|
|
| 2011 | 52 | 51 |
22.7%
|
|
| 9997 | Inconsistent (Secondary Editing) | 1 | 1 |
0.5%
|
| 9999 | Missing | 67 | 67 |
29.7%
|
| Sysmiss | 4599 | 4487 |