Year % of total population 1960 83.3503253702553 1961 82.89175666082929 1962 82.43064772081402 1963 81.9644924780956 1964 81.49050549182915 1965 81.57514487530247 1966 81.62859315293784 1967 81.64395904211035 1968 81.65776839516877 1969 81.6705456354599 1970 81.67723528471316 1971 81.65323356115051 1972 81.60929239206848 1973 81.47767389570399 1974 81.2676748140657 1975 81.21083175749284 1976 81.0442116467811 1977 80.8739397577776 1978 80.46566566431545 1979 79.8100126111828 1980 79.12101513817818 1981 78.4046937315498 1982 77.67719758937169 1983 77.04926014124767 1984 76.40347922943555 1985 75.74723735373155 1986 75.08018441936014 1987 74.40146061634749 1988 73.70925742972133 1989 73.00380590575371 1990 72.28419456711855 1991 71.49940963801069 1992 70.69023467597783 1993 69.8684030503117 1994 69.0305784374028 1995 68.17801011466054 1996 67.30917239952727 1997 66.43031379950688 1998 65.53869389119589 1999 64.63607107661052 2000 63.70833933733118 2001 62.66540041874678 2002 61.54208888527364 2003 60.40717553743922 2004 59.261793762275545 2005 58.112297799949594 2006 56.98762255728164 2007 55.87552983600927 2008 54.75833885114081 2009 53.6420162748437 2010 52.52598328306412 2011 51.474760142846556 2012 50.44895598984686 2013 49.42937115013533 2014 48.4126476505579 2015 47.401391236896075 2016 46.39522465005975 2017 45.39765084148518 2018 44.4251470729526 2019 43.48078960583271 2020 42.56528211382753 2021 41.67858221296097 2022 40.81917680015034 2023 39.98999893352871