| Value | Category | Cases | |
|---|---|---|---|
| 1977 | 1 |
0%
|
|
| 1978 | 2 |
0%
|
|
| 1979 | 3 |
0%
|
|
| 1980 | 26 |
0.1%
|
|
| 1981 | 30 |
0.1%
|
|
| 1982 | 64 |
0.2%
|
|
| 1983 | 71 |
0.2%
|
|
| 1984 | 120 |
0.3%
|
|
| 1985 | 169 |
0.4%
|
|
| 1986 | 256 |
0.7%
|
|
| 1987 | 294 |
0.8%
|
|
| 1988 | 306 |
0.8%
|
|
| 1989 | 328 |
0.9%
|
|
| 1990 | 511 |
1.4%
|
|
| 1991 | 420 |
1.1%
|
|
| 1992 | 491 |
1.3%
|
|
| 1993 | 421 |
1.1%
|
|
| 1994 | 536 |
1.4%
|
|
| 1995 | 603 |
1.6%
|
|
| 1996 | 674 |
1.8%
|
|
| 1997 | 708 |
1.9%
|
|
| 1998 | 666 |
1.8%
|
|
| 1999 | 665 |
1.8%
|
|
| 2000 | 965 |
2.6%
|
|
| 2001 | 797 |
2.1%
|
|
| 2002 | 785 |
2.1%
|
|
| 2003 | 811 |
2.2%
|
|
| 2004 | 792 |
2.1%
|
|
| 2005 | 901 |
2.4%
|
|
| 2006 | 935 |
2.5%
|
|
| 2007 | 986 |
2.6%
|
|
| 2008 | 1027 |
2.7%
|
|
| 2009 | 1026 |
2.7%
|
|
| 2010 | 1109 |
2.9%
|
|
| 2011 | 1020 |
2.7%
|
|
| 2012 | 1078 |
2.9%
|
|
| 2013 | 1055 |
2.8%
|
|
| 2014 | 1039 |
2.8%
|
|
| 2015 | 1081 |
2.9%
|
|
| 2016 | 1309 |
3.5%
|
|
| 2017 | 195 |
0.5%
|
|
| 9997 | Inconsistant | 158 |
0.4%
|
| 9998 | DK | 677 |
1.8%
|
| 9999 | Missing | 20 |
0.1%
|
| Sysmiss | 12538 |
33.3%
|