Year | Self-report rate |
---|---|
1977 | 96.6 |
1978 | 96.3 |
1979 | 96.4 |
1980 | 96.2 |
1981 | 95.7 |
1982 | 95.3 |
1983 | 95.5 |
1984 | 95.1 |
1985 | 94.8 |
1986 | 93.5 |
1987 | 93.1 |
1988 | 92.9 |
1989 | 92.3 |
1990 | 93.6 |
1991 | 94.6 |
1992 | 95.1 |
1993 | 94.7 |
1994 | 94.6 |
1995 | 94.2 |
1996 | 93.0 |
1997 | 91.6 |
1998 | 91.9 |
1999 | 91.9 |
2000 | 92.4 |
2001 | 92.7 |
2002 | 91.3 |
2003 | 91.6 |
2004 | 91.3 |
2005 | 92.1 |
2006 | 93.1 |
2007 | 91.7 |
2008 | 92.3 |
2009 | 92.6 |
2010 | 93.0 |
2011 | 92.9 |
2012 | 92.5 |
2013 | 92.0 |
2014 | 90.6 |
2015 | 90.3 |
2016 | 91.8 |