Year % of total population 1960 44.98158809230921 1961 45.28352406434976 1962 45.53989509941796 1963 45.73180228293229 1964 45.93350151853071 1965 46.15227352992905 1966 46.34074153289098 1967 46.484898384760015 1968 46.56234626402351 1969 46.54091412875043 1970 46.31362332884332 1971 45.86382831059645 1972 45.28750646680535 1973 44.64620532782898 1974 43.975954574623245 1975 43.26664993355185 1976 42.527053870667615 1977 41.78197852317855 1978 41.05090758196761 1979 40.35217096387676 1980 39.67962014078014 1981 38.97973133704687 1982 38.281963116842 1983 37.667854312721445 1984 37.149966333538586 1985 36.7165060513988 1986 36.340462789025175 1987 36.005970542976236 1988 35.71192166161697 1989 35.468857068065 1990 35.25961632045935 1991 35.03796649999382 1992 34.82766714058012 1993 34.65985517766967 1994 34.5091731611232 1995 34.300647503303345 1996 34.024897680296846 1997 33.73057634085949 1998 33.411754842708135 1999 33.071945657193325 2000 32.71212415270448 2001 32.334117002724625 2002 31.949953739659726 2003 31.538498121378055 2004 31.135569430745765 2005 30.75265769838208 2006 30.33635093112656 2007 29.900535458170484 2008 29.476617922498143 2009 29.06759181904994 2010 28.60196196820632 2011 28.089354707253115 2012 27.605380211596433 2013 27.164961843329365 2014 26.76806535244615 2015 26.38114458624952 2016 26.004755383808284 2017 25.661876099974265 2018 25.24256048896464 2019 24.891778807554964 2020 24.634882500929784 2021 24.351647938743916 2022 24.08991374308535 2023 23.79955244943202