Year % of total population 1960 55.6428934305193 1961 55.5305533264706 1962 55.328601329837 1963 55.0664465121317 1964 54.7367675502847 1965 54.3587459463438 1966 53.9855190320848 1967 53.6642871775114 1968 53.3989602999255 1969 53.1926473735846 1970 53.0358079402172 1971 52.9084218433055 1972 52.809144066119 1973 52.7478425600423 1974 52.7294439632341 1975 52.7600904067423 1976 52.8341482853643 1977 52.9285336641864 1978 53.025739453915 1979 53.1868004612121 1980 53.5150780120132 1981 53.8782083375094 1982 54.0550769355418 1983 54.0033746238981 1984 53.7605857214363 1985 53.5480788731016 1986 53.4227847888405 1987 53.2945189361228 1988 53.1569225272437 1989 52.9839099285288 1990 52.8094263238851 1991 52.6514466190186 1992 52.3411841042489 1993 52.0968215670331 1994 52.0579743121247 1995 52.1154033148886 1996 52.3012020503442 1997 52.5448071482636 1998 52.846260377791 1999 53.1794876954099 2000 53.6185055504028 2001 54.0931180357825 2002 54.4084414326882 2003 54.6708561835277 2004 55.0023779858284 2005 55.3577164048344 2006 55.7211678759932 2007 56.0783465140423 2008 56.4048993084594 2009 56.7224057984879 2010 57.0279230568377 2011 57.2729921276312 2012 57.41903558725 2013 57.4984290989098 2014 57.5815610372601 2015 57.6676168775989 2016 57.7487304468856 2017 57.8894318876698 2018 58.0944927829515 2019 58.3067436205576 2020 58.553442363316 2021 58.8384851700352 2022 59.1607587601159 2023 59.5091879855663