Year per 1,000 people 1960 43.905 1961 43.7 1962 43.488 1963 43.361 1964 43.173 1965 42.865 1966 42.86 1967 42.84 1968 42.823 1969 42.796 1970 42.954 1971 42.84 1972 42.33 1973 41.785 1974 41.283 1975 40.781 1976 40.767 1977 40.753 1978 40.745 1979 40.504 1980 39.97 1981 39.618 1982 39.196 1983 38.651 1984 38.034 1985 37.314 1986 36.575 1987 35.939 1988 35.382 1989 34.694 1990 34.149 1991 33.747 1992 33.427 1993 33.046 1994 32.525 1995 32.167 1996 32.385 1997 32.386 1998 32.257 1999 31.867 2000 31.423 2001 30.357 2002 29.213 2003 28.327 2004 27.647 2005 26.962 2006 26.139 2007 25.431 2008 24.819 2009 24.284 2010 23.696 2011 23.405 2012 22.975 2013 22.652 2014 22.266 2015 21.855 2016 21.714 2017 21.451 2018 21.2 2019 21.059 2020 20.837 2021 20.777 2022 20.684