Year per 1,000 people 1960 8.89999961853027 1961 9 1962 9.19999980926514 1963 9.30000019073486 1964 9.5 1965 9.60000038146973 1966 9.69999980926514 1967 9.89999961853027 1968 10.1000003814697 1969 10.3000001907349 1970 10.6000003814697 1971 10.6000003814697 1972 10.6000003814697 1973 10.5 1974 10.6000003814697 1975 10.6000003814697 1976 10.3999996185303 1977 10.3000001907349 1978 10 1979 9.80000019073486 1980 9.60000038146973 1981 9.39999961853027 1982 9.10000038146973 1983 8.89999961853027 1984 8.5 1985 8.30000019073486 1986 8 1987 7.80000019073486 1988 7.5 1989 7.09999990463257 1990 7.1999998093 1991 6.8000001907 1992 6.9000000954 1993 6.6999998093 1994 6.5999999046 1995 6.3000001907 1996 6.5 1997 5.9000000954 1998 5.5 1999 4.9000000954 2000 4.71 2001 4.61 2002 4.44 2003 4.18 2004 4.02 2005 4.04 2006 3.99 2007 3.91 2008 3.79 2009 3.69 2010 3.64 2011 3.52 2012 3.42 2013 3.31 2014 3.21 2015 3.2 2016 3.17 2017 3.18 2018 3.14