Year % of total population 1960 43.26916261286506 1961 43.42191709852825 1962 43.5314951626131 1963 43.5931994366242 1964 43.60193729212943 1965 43.56809177103039 1966 43.504881897699356 1967 43.40773620247095 1968 43.276208426129536 1969 43.11563088551337 1970 42.926428430014944 1971 42.69123605731019 1972 42.41445100911683 1973 42.12114106869925 1974 41.81425572702645 1975 41.49747885317871 1976 41.179318082978504 1977 40.857693775856816 1978 40.53267162261809 1979 40.208915915667454 1980 39.89000191255899 1981 39.58139147906004 1982 39.28725665927322 1983 39.00249860532804 1984 38.71698529815582 1985 38.42405973867991 1986 38.11668218111119 1987 37.792026746775456 1988 37.45346020303502 1989 37.10463931472975 1990 36.74015515454818 1991 36.35816585183799 1992 35.964549276810295 1993 35.560798344789816 1994 35.14485002631466 1995 34.71989025929989 1996 34.284103775722876 1997 33.835104618816175 1998 33.38162164865534 1999 32.927184553872266 2000 32.473329903325634 2001 32.01905474434976 2002 31.558972565718054 2003 31.093238616880175 2004 30.625273774542126 2005 30.16057430814024 2006 29.70039631101829 2007 29.246361377173542 2008 28.79665293058186 2009 28.35053684810765 2010 27.91277512668914 2011 27.485840847252977 2012 27.067597944083534 2013 26.64920011640864 2014 26.239497247854914 2015 25.846581289343288 2016 25.46720550878163 2017 25.101835272033647 2018 24.75234594807726 2019 24.409173680073515 2020 24.072593875421056 2021 23.749194148217583 2022 23.42206489074457 2023 23.07795975778983