Year % of total population 1960 40.716168597731695 1961 40.537409152002596 1962 40.6367228917382 1963 41.185502880867126 1964 41.68029843132223 1965 41.90188592783996 1966 41.9935032189688 1967 41.87803556170631 1968 41.73505749327328 1969 41.662321713045266 1970 41.52220837725289 1971 41.3903214524913 1972 41.15326112951641 1973 40.905329285140986 1974 40.833750587015494 1975 40.79373578505512 1976 40.7136111031435 1977 40.263933071753485 1978 39.236523365302205 1979 38.15564927130631 1980 37.24610404663688 1981 36.42053311149301 1982 35.75222731016527 1983 35.001938194200335 1984 34.12750139114519 1985 33.31636879565733 1986 32.60998935950456 1987 32.066371223371405 1988 31.593233984549 1989 31.203237409518053 1990 30.98365576326138 1991 30.776916354286726 1992 30.503389374657534 1993 30.220230045539534 1994 29.87324489939648 1995 29.451923088485543 1996 28.962799202257838 1997 28.376130209788133 1998 27.789467695544683 1999 27.235537354328294 2000 26.650499237491786 2001 26.002709207757547 2002 25.26498123735849 2003 24.532895364928237 2004 23.830683856967905 2005 23.1074333463981 2006 22.515633707774104 2007 22.122423802873104 2008 21.819469462557453 2009 21.579684075012434 2010 21.381425641203755 2011 21.217353244197383 2012 21.118675710889157 2013 21.060160383558603 2014 21.01327554330765 2015 20.9428900876541 2016 20.869463252344122 2017 20.839295438378425 2018 20.762834370874504 2019 20.610215262551776 2020 20.385873937277463 2021 20.08461959226802 2022 19.737820671386608 2023 19.358315790933894