| Valor | Categoría | Casos | |
|---|---|---|---|
| 2008 | 1 |
0%
|
|
| 2009 | 53 |
1.1%
|
|
| 2010 | 177 |
3.6%
|
|
| 2011 | 4705 |
95.3%
|
|
| Sysmiss | 274 |