Year % of total population 1960 76.06206146900708 1961 75.5633031390997 1962 75.09159688187819 1963 74.64971817094728 1964 74.20012417057801 1965 73.96584010305037 1966 73.73893957095179 1967 73.49751797358988 1968 73.25825080230297 1969 73.0251866766843 1970 72.79595104765293 1971 72.5460238900771 1972 72.26177243168395 1973 71.94655444027059 1974 71.59355958513532 1975 71.2833432356075 1976 70.91705591521627 1977 70.54611964141262 1978 70.09073918145886 1979 69.55423816116561 1980 69.00569887176906 1981 68.45062280755982 1982 67.93566806315158 1983 67.46002404608767 1984 66.96723939718116 1985 66.47226427927542 1986 65.97930809231988 1987 65.49155381583842 1988 65.00625055332046 1989 64.5372557006861 1990 64.08127872568829 1991 63.623213773578115 1992 63.17453454661949 1993 62.72940217964711 1994 62.279793614946136 1995 61.83213727171352 1996 61.38904757782061 1997 60.93873273815105 1998 60.48175205684686 1999 60.02443349757973 2000 59.55917316205923 2001 59.043656079441156 2002 58.48860024498414 2003 57.92853023204328 2004 57.35944416568422 2005 56.78386813116668 2006 56.21688765343005 2007 55.66169872870586 2008 55.09070583937481 2009 54.52085954936737 2010 53.95403832917793 2011 53.41393915436109 2012 52.88305493467631 2013 52.34420781180523 2014 51.797747557754725 2015 51.24617098937426 2016 50.702003476759174 2017 50.16318408574233 2018 49.631483208338885 2019 49.10785546516669 2020 48.59659386752805 2021 48.09429490436554 2022 47.60882374072799 2023 47.11720381757566