| Value | Category | Cases | |
|---|---|---|---|
| 1980 | 1 |
0.1%
|
|
| 1990 | 1 |
0.1%
|
|
| 1991 | 1 |
0.1%
|
|
| 1994 | 1 |
0.1%
|
|
| 1998 | 1 |
0.1%
|
|
| 1999 | 1 |
0.1%
|
|
| 2000 | 5 |
0.3%
|
|
| 2002 | 1 |
0.1%
|
|
| 2003 | 1 |
0.1%
|
|
| 2004 | 2 |
0.1%
|
|
| 2005 | 1 |
0.1%
|
|
| 2006 | 3 |
0.2%
|
|
| 2007 | 1 |
0.1%
|
|
| 2008 | 3 |
0.2%
|
|
| 2009 | 2 |
0.1%
|
|
| 2010 | 8 |
0.5%
|
|
| 2011 | 1 |
0.1%
|
|
| 2012 | 1 |
0.1%
|
|
| 2013 | 3 |
0.2%
|
|
| 2014 | 9 |
0.6%
|
|
| 2015 | 264 |
16.9%
|
|
| 2016 | 181 |
11.6%
|
|
| 2017 | 315 |
20.2%
|
|
| 2018 | 125 |
8%
|
|
| Missing value | 626 |
40.2%
|