| Value | Category | Cases | |
|---|---|---|---|
| 1980 | 2 |
0%
|
|
| 1983 | 7 |
0.1%
|
|
| 1984 | 11 |
0.1%
|
|
| 1985 | 26 |
0.2%
|
|
| 1986 | 43 |
0.3%
|
|
| 1987 | 47 |
0.3%
|
|
| 1988 | 88 |
0.6%
|
|
| 1989 | 112 |
0.8%
|
|
| 1990 | 137 |
1%
|
|
| 1991 | 167 |
1.2%
|
|
| 1992 | 199 |
1.4%
|
|
| 1993 | 221 |
1.6%
|
|
| 1994 | 206 |
1.5%
|
|
| 1995 | 243 |
1.7%
|
|
| 1996 | 279 |
2%
|
|
| 1997 | 339 |
2.4%
|
|
| 1998 | 377 |
2.7%
|
|
| 1999 | 395 |
2.8%
|
|
| 2000 | 380 |
2.7%
|
|
| 2001 | 388 |
2.8%
|
|
| 2002 | 460 |
3.3%
|
|
| 2003 | 445 |
3.2%
|
|
| 2004 | 422 |
3%
|
|
| 2005 | 491 |
3.5%
|
|
| 2006 | 496 |
3.6%
|
|
| 2007 | 552 |
4%
|
|
| 2008 | 616 |
4.4%
|
|
| 2009 | 557 |
4%
|
|
| 2010 | 604 |
4.3%
|
|
| 2011 | 611 |
4.4%
|
|
| 2012 | 706 |
5.1%
|
|
| 2013 | 755 |
5.4%
|
|
| 2014 | 827 |
6%
|
|
| 2015 | 867 |
6.2%
|
|
| 2016 | 754 |
5.4%
|
|
| 2017 | 736 |
5.3%
|
|
| 2018 | 279 |
2%
|
|
| 9999 | No response | 45 |
0.3%
|