| Value | Category | Cases | |
|---|---|---|---|
| 1997 | 1 |
1.6%
|
|
| 2000 | 1 |
1.6%
|
|
| 2007 | 1 |
1.6%
|
|
| 2008 | 2 |
3.1%
|
|
| 2009 | 1 |
1.6%
|
|
| 2010 | 3 |
4.7%
|
|
| 2011 | 5 |
7.8%
|
|
| 2012 | 50 |
78.1%
|
|
| Sysmiss | 3075 |