| Value | Category | Cases | |
|---|---|---|---|
| 1972 | 1 |
1.8%
|
|
| 1993 | 2 |
3.6%
|
|
| 1998 | 1 |
1.8%
|
|
| 2000 | 1 |
1.8%
|
|
| 2001 | 1 |
1.8%
|
|
| 2002 | 1 |
1.8%
|
|
| 2004 | 2 |
3.6%
|
|
| 2005 | 1 |
1.8%
|
|
| 2007 | 2 |
3.6%
|
|
| 2008 | 1 |
1.8%
|
|
| 2009 | 1 |
1.8%
|
|
| 2010 | 1 |
1.8%
|
|
| 2011 | 3 |
5.5%
|
|
| 2012 | 1 |
1.8%
|
|
| 2013 | 3 |
5.5%
|
|
| 2014 | 2 |
3.6%
|
|
| 2015 | 6 |
10.9%
|
|
| 2016 | 7 |
12.7%
|
|
| 2017 | 14 |
25.5%
|
|
| 2018 | 4 |
7.3%
|
|
| Sysmiss | 2583 |