Year % of total population 1960 82.648 1961 82.09700000000001 1962 81.533 1963 80.94 1964 80.288 1965 79.621 1966 78.936 1967 78.235 1968 77.51599999999999 1969 76.782 1970 76.031 1971 75.263 1972 74.47800000000001 1973 73.679 1974 72.863 1975 72.271 1976 71.86 1977 71.446 1978 71.02799999999999 1979 70.606 1980 70.181 1981 69.752 1982 69.32 1983 68.885 1984 68.445 1985 68.003 1986 67.675 1987 67.445 1988 67.213 1989 66.981 1990 66.74799999999999 1991 66.515 1992 66.28 1993 66.045 1994 65.80799999999999 1995 65.571 1996 65.333 1997 65.095 1998 64.856 1999 64.616 2000 64.374 2001 64.13300000000001 2002 63.891 2003 63.648 2004 63.404 2005 63.081 2006 62.697 2007 62.311 2008 61.923 2009 61.534 2010 61.144 2011 60.752 2012 60.358 2013 59.964 2014 59.568 2015 59.171 2016 58.772 2017 58.364 2018 57.945 2019 57.516 2020 57.077 2021 56.628 2022 56.169 2023 55.7