Year % of total population 1960 48.139280890786345 1961 48.17322952858922 1962 48.207669188905484 1963 48.238563787019594 1964 48.27132481483918 1965 48.30499489459173 1966 48.33624649026571 1967 48.367855085741255 1968 48.39762193182148 1969 48.42602599273978 1970 48.45335945855094 1971 48.49480389426076 1972 48.55209916579268 1973 48.611658737043186 1974 48.659674615730154 1975 48.697102962456235 1976 48.74051115021933 1977 48.781774485190354 1978 48.79566628246675 1979 48.74712859466197 1980 48.72000918379064 1981 48.74929097365786 1982 48.76356743526347 1983 48.767969324123875 1984 48.773746342181276 1985 48.779312738119856 1986 48.78751098345462 1987 48.80905011939947 1988 48.83635541834446 1989 48.85948513900561 1990 48.879179256441816 1991 48.889127139183664 1992 48.88982394851052 1993 48.886227337406524 1994 48.88338875352425 1995 48.884756891110236 1996 48.89096497158166 1997 48.89815565250597 1998 48.904838002860096 1999 48.910279957395076 2000 48.91785120589171 2001 48.9315679299368 2002 48.94567593523429 2003 48.95820061327288 2004 48.97038403831996 2005 48.983892687874935 2006 48.99606281313367 2007 49.00596475056129 2008 49.036955708756715 2009 49.088658079941176 2010 49.138111958759055 2011 49.18643362821212 2012 49.23397553311477 2013 49.27843622862557 2014 49.32054439597758 2015 49.36345996135602 2016 49.40516247364526 2017 49.44371831806857 2018 49.4819191578766 2019 49.51905901650982 2020 49.54579968435638 2021 49.5627692701446 2022 49.57470939011808 2023 49.581137441891016