| Value | Category | Cases | |
|---|---|---|---|
| 1990 | 1 |
0.2%
|
|
| 1993 | 1 |
0.2%
|
|
| 1995 | 1 |
0.2%
|
|
| 1998 | 1 |
0.2%
|
|
| 1999 | 1 |
0.2%
|
|
| 2000 | 3 |
0.5%
|
|
| 2002 | 1 |
0.2%
|
|
| 2003 | 3 |
0.5%
|
|
| 2004 | 1 |
0.2%
|
|
| 2005 | 5 |
0.8%
|
|
| 2006 | 3 |
0.5%
|
|
| 2007 | 2 |
0.3%
|
|
| 2008 | 8 |
1.2%
|
|
| 2009 | 1 |
0.2%
|
|
| 2010 | 4 |
0.6%
|
|
| 2011 | 1 |
0.2%
|
|
| 2012 | 7 |
1.1%
|
|
| 2013 | 1 |
0.2%
|
|
| 2014 | 1 |
0.2%
|
|
| 2015 | 1 |
0.2%
|
|
| 2016 | 4 |
0.6%
|
|
| 2017 | 595 |
89.9%
|
|
| 2018 | 15 |
2.3%
|
|
| 2019 | 1 |
0.2%
|