Year % of total population 1960 50.583070455523035 1961 49.78240254657565 1962 48.96913459398681 1963 48.15269337592156 1964 47.33139393717896 1965 46.56473710218134 1966 45.798411171408596 1967 45.03296142128139 1968 44.26657197348158 1969 43.50472070654449 1970 42.74893199684813 1971 41.98778349842987 1972 41.23349947974869 1973 40.501750293051884 1974 39.77541659083108 1975 39.049655870835565 1976 38.328031448195624 1977 37.60653977633532 1978 36.88721107937994 1979 36.17489517482196 1980 35.46472554402736 1981 34.77218809792419 1982 34.11362088117316 1983 33.476073426816896 1984 32.8463606234546 1985 32.22422244477619 1986 31.61772427779186 1987 31.023789859352448 1988 30.438778386982797 1989 29.865407639512497 1990 29.307268226477497 1991 28.784949233964937 1992 28.285489873401193 1993 27.79780309738425 1994 27.303841906827323 1995 26.81475963718663 1996 26.3475594866036 1997 25.871558298072266 1998 25.400860735696828 1999 24.946596022865446 2000 24.497632304164775 2001 24.13927485806507 2002 23.81007491286888 2003 23.48897669705832 2004 23.180869166754167 2005 22.877544989381107 2006 22.57704709103643 2007 22.280313098105225 2008 21.98998973952382 2009 21.706867360645703 2010 21.430950391376637 2011 21.151059316146945 2012 20.879491189982875 2013 20.613665785428555 2014 20.350403922226533 2015 20.08991932286243 2016 19.83424775293808 2017 19.585607412712303 2018 19.349351159409384 2019 19.11120245309275 2020 18.86548684460373 2021 18.62304244433336 2022 18.378868573102285 2023 18.131526861432356