| Value | Category | Cases | |
|---|---|---|---|
| 1991 | 2 |
0.1%
|
|
| 1992 | 2 |
0.1%
|
|
| 1993 | 1 |
0.1%
|
|
| 1994 | 2 |
0.1%
|
|
| 1996 | 3 |
0.2%
|
|
| 1998 | 1 |
0.1%
|
|
| 1999 | 2 |
0.1%
|
|
| 2000 | 8 |
0.5%
|
|
| 2001 | 15 |
0.9%
|
|
| 2002 | 4 |
0.2%
|
|
| 2003 | 12 |
0.7%
|
|
| 2004 | 14 |
0.9%
|
|
| 2005 | 14 |
0.9%
|
|
| 2006 | 7 |
0.4%
|
|
| 2007 | 9 |
0.6%
|
|
| 2008 | 8 |
0.5%
|
|
| 2009 | 4 |
0.2%
|
|
| 2010 | 6 |
0.4%
|
|
| 2011 | 13 |
0.8%
|
|
| 2012 | 5 |
0.3%
|
|
| 2013 | 2 |
0.1%
|
|
| 2014 | 5 |
0.3%
|
|
| 2015 | 177 |
11%
|
|
| 2016 | 264 |
16.4%
|
|
| 2017 | 136 |
8.4%
|
|
| 2018 | 336 |
20.9%
|
|
| 2019 | 89 |
5.5%
|
|
| Missing value | 469 |
29.1%
|