| Value | Category | Cases | |
|---|---|---|---|
| 2000 | 1 |
0.2%
|
|
| 2004 | 1 |
0.2%
|
|
| 2009 | 103 |
22.9%
|
|
| 2010 | 344 |
76.6%
|
|
| Sysmiss | 2366 |