Year % of total population 1960 50.0861400518224 1961 50.0497236986623 1962 50.0151787446657 1963 49.9823861504818 1964 49.9470286264089 1965 49.9076826192245 1966 49.8670868073128 1967 49.8245326330501 1968 49.7789913437217 1969 49.7265458693123 1970 49.6673255049252 1971 49.605915825103 1972 49.5389718711163 1973 49.466533889119 1974 49.393605523993 1975 49.3208266029979 1976 49.2650187091807 1977 49.2269861724034 1978 49.1915484100293 1979 49.1581169159076 1980 49.1249767245028 1981 49.0918978475265 1982 49.0607488901316 1983 49.0317828071834 1984 49.0036915088648 1985 48.9759666796507 1986 48.9425408678468 1987 48.9043859543015 1988 48.8684302869619 1989 48.8336412311739 1990 48.7985930115123 1991 48.7635605832032 1992 48.7288076475744 1993 48.693921677864 1994 48.6592402063358 1995 48.6243493438893 1996 48.5897218555689 1997 48.5555777088253 1998 48.520956525657 1999 48.4856950200414 2000 48.4457011430571 2001 48.3974408494068 2002 48.3437327325665 2003 48.289651205576 2004 48.2405250043681 2005 48.2152357154806 2006 48.2118315061756 2007 48.2125341467159 2008 48.2169438444471 2009 48.2237670730672 2010 48.2320110264981 2011 48.2418238495114 2012 48.2533913672347 2013 48.2668180930918 2014 48.2825529194831 2015 48.3020543561248 2016 48.3254564021084 2017 48.3505639647011 2018 48.3746332843309 2019 48.394080169548 2020 48.4142421624888 2021 48.4345029273902 2022 48.4508270144216 2023 48.4674161609859