| Value | Category | Cases | |
|---|---|---|---|
| 1971 | 1 |
1.3%
|
|
| 1980 | 1 |
1.3%
|
|
| 1991 | 1 |
1.3%
|
|
| 1996 | 1 |
1.3%
|
|
| 1999 | 1 |
1.3%
|
|
| 2000 | 15 |
20%
|
|
| 2001 | 1 |
1.3%
|
|
| 2002 | 1 |
1.3%
|
|
| 2003 | 2 |
2.7%
|
|
| 2004 | 3 |
4%
|
|
| 2005 | 2 |
2.7%
|
|
| 2006 | 8 |
10.7%
|
|
| 2007 | 4 |
5.3%
|
|
| 2008 | 3 |
4%
|
|
| 2009 | 6 |
8%
|
|
| 2010 | 8 |
10.7%
|
|
| 2012 | 6 |
8%
|
|
| 2013 | 3 |
4%
|
|
| 2014 | 4 |
5.3%
|
|
| 2015 | 4 |
5.3%
|
|
| Sysmiss | 4881 |