Year % of total population 1960 42.5420337150806 1961 42.701951782809 1962 42.8569333920922 1963 43.0314110922312 1964 43.1902924053117 1965 43.3091093151255 1966 43.4224906400758 1967 43.5352511497881 1968 43.6604031009493 1969 43.8021017040272 1970 43.9570292954965 1971 44.1366418059318 1972 44.3353817713993 1973 44.5669145296866 1974 44.8154637653285 1975 45.0446426788916 1976 45.3312368775153 1977 45.6318023212183 1978 46.194307357676 1979 46.6742014803611 1980 46.9347388071744 1981 47.3900223163308 1982 47.4775999096985 1983 47.1629405310596 1984 46.81737993935 1985 46.4182652511499 1986 45.9521121428879 1987 45.4618271960447 1988 44.8988740418677 1989 43.4653396166357 1990 42.3552476934079 1991 42.2478678908207 1992 42.2093786152576 1993 42.189756559411 1994 42.1799173408947 1995 42.1395248012842 1996 42.0502446416554 1997 41.9714961003802 1998 41.9112729434495 1999 41.8338251482122 2000 41.7117474676234 2001 41.5079165213363 2002 41.1995075521902 2003 40.7974992495138 2004 40.3177159186153 2005 39.7128941623596 2006 39.0276045300464 2007 38.3829611012525 2008 37.8212176636205 2009 37.3639544479367 2010 37.0301969184057 2011 36.8231293266718 2012 36.6916497114147 2013 36.5697365854544 2014 36.4421817021036 2015 36.3341020123503 2016 36.2702466092095 2017 36.2452466839654 2018 36.2383533474208 2019 36.2264317517318 2020 36.2036368194422 2021 36.2059687753752 2022 36.2407467824952 2023 36.2219930173583