| Value | Category | Cases | |
|---|---|---|---|
| 1960 | 2 |
3.8%
|
|
| 1978 | 1 |
1.9%
|
|
| 1998 | 2 |
3.8%
|
|
| 2001 | 1 |
1.9%
|
|
| 2007 | 1 |
1.9%
|
|
| 2008 | 1 |
1.9%
|
|
| 2009 | 2 |
3.8%
|
|
| 2011 | 2 |
3.8%
|
|
| 2012 | 13 |
25%
|
|
| 2013 | 27 |
51.9%
|
|
| Sysmiss | 547 |