| Value | Category | Cases | |
|---|---|---|---|
| 2008 | 1 |
4.5%
|
|
| 2009 | 3 |
13.6%
|
|
| 2010 | 2 |
9.1%
|
|
| 2011 | 5 |
22.7%
|
|
| 2012 | 6 |
27.3%
|
|
| 2013 | 4 |
18.2%
|
|
| 9999 | NO SABE / NO RESPONDE | 1 |
4.5%
|
| Sysmiss | 656 |