| Value | Category | Cases | |
|---|---|---|---|
| 1960 | 2 |
4.8%
|
|
| 1970 | 2 |
4.8%
|
|
| 1981 | 2 |
4.8%
|
|
| 1984 | 1 |
2.4%
|
|
| 1985 | 1 |
2.4%
|
|
| 1995 | 1 |
2.4%
|
|
| 1999 | 2 |
4.8%
|
|
| 2000 | 1 |
2.4%
|
|
| 2002 | 1 |
2.4%
|
|
| 2004 | 1 |
2.4%
|
|
| 2005 | 3 |
7.1%
|
|
| 2006 | 2 |
4.8%
|
|
| 2007 | 1 |
2.4%
|
|
| 2008 | 3 |
7.1%
|
|
| 2009 | 1 |
2.4%
|
|
| 2010 | 3 |
7.1%
|
|
| 2011 | 8 |
19%
|
|
| 2012 | 7 |
16.7%
|
|
| Sysmiss | 635 |