| Value | Category | Cases | |
|---|---|---|---|
| 2001 | 1 |
0.1%
|
|
| 2010 | 4 |
0.4%
|
|
| 2011 | 131 |
14.7%
|
|
| 2012 | 755 |
84.7%
|
|
| Sysmiss | 222 |