| Value | Category | Cases | |
|---|---|---|---|
| 1980 | 10 |
0.1%
|
|
| 1983 | 39 |
0.3%
|
|
| 1984 | 56 |
0.4%
|
|
| 1985 | 128 |
0.9%
|
|
| 1986 | 180 |
1.3%
|
|
| 1987 | 160 |
1.2%
|
|
| 1988 | 271 |
2%
|
|
| 1989 | 267 |
1.9%
|
|
| 1990 | 353 |
2.5%
|
|
| 1991 | 384 |
2.8%
|
|
| 1992 | 414 |
3%
|
|
| 1993 | 473 |
3.4%
|
|
| 1994 | 463 |
3.3%
|
|
| 1995 | 450 |
3.2%
|
|
| 1996 | 410 |
3%
|
|
| 1997 | 496 |
3.6%
|
|
| 1998 | 519 |
3.7%
|
|
| 1999 | 539 |
3.9%
|
|
| 2000 | 505 |
3.6%
|
|
| 2001 | 491 |
3.5%
|
|
| 2002 | 497 |
3.6%
|
|
| 2003 | 539 |
3.9%
|
|
| 2004 | 441 |
3.2%
|
|
| 2005 | 534 |
3.8%
|
|
| 2006 | 520 |
3.7%
|
|
| 2007 | 428 |
3.1%
|
|
| 2008 | 604 |
4.3%
|
|
| 2009 | 531 |
3.8%
|
|
| 2010 | 524 |
3.8%
|
|
| 2011 | 457 |
3.3%
|
|
| 2012 | 437 |
3.1%
|
|
| 2013 | 405 |
2.9%
|
|
| 2014 | 386 |
2.8%
|
|
| 2015 | 371 |
2.7%
|
|
| 2016 | 262 |
1.9%
|
|
| 2017 | 228 |
1.6%
|
|
| 2018 | 67 |
0.5%
|
|
| 9999 | No response | 51 |
0.4%
|