| Value | Category | Cases | |
|---|---|---|---|
| 1977 | 1 |
0%
|
|
| 1978 | 10 |
0%
|
|
| 1979 | 10 |
0%
|
|
| 1980 | 63 |
0.2%
|
|
| 1981 | 65 |
0.3%
|
|
| 1982 | 114 |
0.4%
|
|
| 1983 | 181 |
0.7%
|
|
| 1984 | 285 |
1.1%
|
|
| 1985 | 400 |
1.6%
|
|
| 1986 | 368 |
1.4%
|
|
| 1987 | 494 |
1.9%
|
|
| 1988 | 522 |
2.1%
|
|
| 1989 | 567 |
2.2%
|
|
| 1990 | 756 |
3%
|
|
| 1991 | 608 |
2.4%
|
|
| 1992 | 668 |
2.6%
|
|
| 1993 | 698 |
2.7%
|
|
| 1994 | 725 |
2.8%
|
|
| 1995 | 829 |
3.3%
|
|
| 1996 | 759 |
3%
|
|
| 1997 | 816 |
3.2%
|
|
| 1998 | 848 |
3.3%
|
|
| 1999 | 848 |
3.3%
|
|
| 2000 | 1042 |
4.1%
|
|
| 2001 | 797 |
3.1%
|
|
| 2002 | 795 |
3.1%
|
|
| 2003 | 813 |
3.2%
|
|
| 2004 | 841 |
3.3%
|
|
| 2005 | 906 |
3.6%
|
|
| 2006 | 891 |
3.5%
|
|
| 2007 | 924 |
3.6%
|
|
| 2008 | 996 |
3.9%
|
|
| 2009 | 976 |
3.8%
|
|
| 2010 | 996 |
3.9%
|
|
| 2011 | 946 |
3.7%
|
|
| 2012 | 959 |
3.8%
|
|
| 2013 | 892 |
3.5%
|
|
| 2014 | 968 |
3.8%
|
|
| 2015 | 482 |
1.9%
|
|
| 2016 | 18 |
0.1%
|
|
| 9998 | don't know | 569 |
2.2%
|
| Sysmiss | 13272 |