| Value | Category | Cases | |
|---|---|---|---|
| 1982 | 1 |
0%
|
|
| 1985 | 2 |
0%
|
|
| 1986 | 2 |
0%
|
|
| 1987 | 14 |
0%
|
|
| 1988 | 27 |
0%
|
|
| 1989 | 31 |
0%
|
|
| 1990 | 60 |
0%
|
|
| 1991 | 37 |
0%
|
|
| 1992 | 79 |
0.1%
|
|
| 1993 | 99 |
0.1%
|
|
| 1994 | 206 |
0.1%
|
|
| 1995 | 365 |
0.2%
|
|
| 1996 | 519 |
0.3%
|
|
| 1997 | 559 |
0.4%
|
|
| 1998 | 840 |
0.5%
|
|
| 1999 | 1338 |
0.8%
|
|
| 2000 | 1543 |
1%
|
|
| 2001 | 1627 |
1%
|
|
| 2002 | 2354 |
1.5%
|
|
| 2003 | 2816 |
1.8%
|
|
| 2004 | 3334 |
2.1%
|
|
| 2005 | 4205 |
2.7%
|
|
| 2006 | 4328 |
2.7%
|
|
| 2007 | 5392 |
3.4%
|
|
| 2008 | 5758 |
3.6%
|
|
| 2009 | 6876 |
4.4%
|
|
| 2010 | 8154 |
5.2%
|
|
| 2011 | 8174 |
5.2%
|
|
| 2012 | 9933 |
6.3%
|
|
| 2013 | 10252 |
6.5%
|
|
| 2014 | 12922 |
8.2%
|
|
| 2015 | 15956 |
10.1%
|
|
| 2016 | 21497 |
13.6%
|
|
| 2017 | 25923 |
16.4%
|
|
| 2018 | 2534 |
1.6%
|
|
| 9997 | Inconsistent | 31 |
0%
|
| 9999 | No response | 111 |
0.1%
|