| Value | Category | Cases | |
|---|---|---|---|
| 1990 | 2 |
3%
|
|
| 1991 | 1 |
1.5%
|
|
| 1994 | 1 |
1.5%
|
|
| 1995 | 1 |
1.5%
|
|
| 1996 | 1 |
1.5%
|
|
| 1998 | 1 |
1.5%
|
|
| 1999 | 1 |
1.5%
|
|
| 2000 | 1 |
1.5%
|
|
| 2002 | 2 |
3%
|
|
| 2003 | 1 |
1.5%
|
|
| 2005 | 2 |
3%
|
|
| 2007 | 3 |
4.5%
|
|
| 2009 | 1 |
1.5%
|
|
| 2010 | 4 |
6%
|
|
| 2011 | 1 |
1.5%
|
|
| 2012 | 5 |
7.5%
|
|
| 2013 | 4 |
6%
|
|
| 2014 | 6 |
9%
|
|
| 2015 | 8 |
11.9%
|
|
| 2016 | 11 |
16.4%
|
|
| 2017 | 7 |
10.4%
|
|
| 2018 | 3 |
4.5%
|
|
| Sysmiss | 215 |