Year % of total population 1960 77.37239275645379 1961 76.78768118341107 1962 76.26087898891141 1963 75.79646220522633 1964 75.32138323641452 1965 75.32075831139456 1966 75.3213002092553 1967 75.27144589084006 1968 75.20152289800964 1969 75.12589073387697 1970 75.04693496369667 1971 74.93039411617085 1972 74.8289848390578 1973 74.64791213023591 1974 74.38920072579043 1975 74.25559036504582 1976 74.06268361143692 1977 73.87504485546498 1978 73.4846824012401 1979 72.87612580404404 1980 72.24065685907084 1981 71.57577257966814 1982 70.91169824671051 1983 70.33784338761178 1984 69.74816016924038 1985 69.15527365658234 1986 68.5501755490197 1987 67.9311856210546 1988 67.30583300151332 1989 66.66789279027314 1990 66.01969447294837 1991 65.32616089840953 1992 64.62422291940578 1993 63.909249957112245 1994 63.17744411885924 1995 62.43214807289771 1996 61.673439822217624 1997 60.91670496692891 1998 60.14615824709994 1999 59.366872344367046 2000 58.55945796792919 2001 57.567483629404784 2002 56.484197422086595 2003 55.4003632808213 2004 54.3135661130984 2005 53.23064562280691 2006 52.1785933427909 2007 51.1413799475851 2008 50.101618381667976 2009 49.07141808531768 2010 48.045914361876676 2011 47.11753152520362 2012 46.22400554338398 2013 45.3362533379636 2014 44.44768566265517 2015 43.56136187443697 2016 42.67779399543951 2017 41.802760927053974 2018 40.94529633361916 2019 40.10908218955825 2020 39.30133707574171 2021 38.52666900575829 2022 37.764190120839295 2023 37.01286670956606