Year per 1,000 people 1960 17.3 1961 17.3 1962 17.1 1963 17.3 1964 17.7 1965 17.8 1966 17.9 1967 17.6 1968 17.6 1969 17.6 1970 16.7 1971 16.8 1972 16.3 1973 15.5 1974 15 1975 14.1 1976 13.3 1977 12.6 1978 12.8 1979 12.7 1980 12.5 1981 12.4 1982 12.5 1983 12.1 1984 12.1 1985 12.3 1986 12.6 1987 12.9 1988 13.7 1989 14 1990 14.4 1991 14.3 1992 14 1993 13.8 1994 13.9 1995 13.8 1996 13.9 1997 13.6 1998 13.2 1999 13.3 2000 13.2 2001 12.6 2002 12.2 2003 12.4 2004 12.4 2005 12.3 2006 12.6 2007 12.4 2008 12.7 2009 12.8 2010 12.6 2011 12.2 2012 12 2013 11.6 2014 11.5 2015 11.3 2016 11.3 2017 10.7 2018 10.4 2019 10.2 2020 9.8 2021 10.4 2022 9.4