Year % of total population 1960 48.57391019571946 1961 48.58616852675768 1962 48.59739679651661 1963 48.60931784579288 1964 48.620954759164164 1965 48.62479692854322 1966 48.616019361902744 1967 48.602820832719665 1968 48.597474396018356 1969 48.60226921508951 1970 48.615340063425556 1971 48.63751859749004 1972 48.6572362580238 1973 48.67001050361248 1974 48.68006177091906 1975 48.68582324286879 1976 48.686658139489616 1977 48.68507141878294 1978 48.680915641754495 1979 48.67890034521275 1980 48.68341234457929 1981 48.69007566051798 1982 48.69471014366399 1983 48.700582674482085 1984 48.7069939814923 1985 48.714557949961375 1986 48.725445947308124 1987 48.73744584474856 1988 48.7498329133496 1989 48.764455605409054 1990 48.78017319958817 1991 48.79591518344784 1992 48.8098876631708 1993 48.820687588667006 1994 48.83038412391284 1995 48.839203787478596 1996 48.84675983499241 1997 48.85331450344343 1998 48.85994557574034 1999 48.86816933271322 2000 48.87592301532824 2001 48.87829748204592 2002 48.87663654009295 2003 48.876208327589424 2004 48.87905222637074 2005 48.88344885597598 2006 48.888722074472305 2007 48.89531489345264 2008 48.90273172587748 2009 48.90787770640216 2010 48.91164310148784 2011 48.92562747581367 2012 48.950345933551446 2013 48.97429845290525 2014 48.99698342266942 2015 49.01981409515573 2016 49.04114837661043 2017 49.05922257020711 2018 49.0753932419979 2019 49.088403586888056 2020 49.09291232742495 2021 49.08637061758033 2022 49.08521132173716 2023 49.07806845713768