Year | Rate |
---|---|
1968 | 2.5 |
1969 | 3 |
1970 | 3.5 |
1971 | 3.3 |
1972 | 3.2 |
1973 | 3 |
1974 | 3 |
1975 | 3.3 |
1976 | 3.1 |
1977 | 2.8 |
1978 | 2.5 |
1979 | 1.1 |
1980 | 1.1 |
1981 | 1.2 |
1982 | 1.2 |
1983 | 1.2 |
1984 | 1.4 |
1985 | 1.5 |
1986 | 1.7 |
1987 | 1.6 |
1988 | 2 |
1989 | 2 |
1990 | 1.8 |
1991 | 2.1 |
1992 | 2.3 |
1993 | 2.8 |
1994 | 3 |
1995 | 3 |
1996 | 3.1 |
1997 | 3.3 |
1998 | 3.6 |
1999 | 6 |
2000 | 6.2 |
2001 | 6.8 |
2002 | 8.2 |
2003 | 8.9 |
2004 | 9.4 |
2005 | 10.1 |
2006 | 11.5 |
2007 | 12 |
2008 | 12 |
2009 | 12.1 |
2010 | 12.4 |
2011 | 13.3 |
2012 | 13.2 |
2013 | 13.9 |
2014 | 14.8 |
2015 | 16.3 |
2016 | 19.7 |
2017 | 21.6 |
2018 | 20.6 |
2019 | 21.5 |
2020 | 28.2 |
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