Year % of total population 1960 50.299051246358054 1961 50.30612188725729 1962 50.31152142081938 1963 50.314522767483076 1964 50.3179724565765 1965 50.32099291466288 1966 50.32292195637612 1967 50.325642713272195 1968 50.32895481964479 1969 50.33127607511142 1970 50.33414448152705 1971 50.327967368963186 1972 50.31311404438103 1973 50.29658841378284 1974 50.27666800760346 1975 50.257308125696746 1976 50.24393799892435 1977 50.23409341978615 1978 50.22982875970457 1979 50.226554977174644 1980 50.19750312673352 1981 50.18857657368398 1982 50.22292178432301 1983 50.27254171971879 1984 50.332560000942934 1985 50.39921194266095 1986 50.4300167232287 1987 50.42038732520018 1988 50.418412258039886 1989 50.41550512656441 1990 50.40761723739939 1991 50.40022291485698 1992 50.40956032284009 1993 50.43436151924953 1994 50.45505205405187 1995 50.47539165917555 1996 50.49880268557883 1997 50.50665663027092 1998 50.499871055990184 1999 50.49388401489398 2000 50.482391414585734 2001 50.46774378127423 2002 50.45175070527031 2003 50.432814866627936 2004 50.41367258633473 2005 50.39602165104184 2006 50.37785152087185 2007 50.3588467048825 2008 50.34145423539323 2009 50.32671741984974 2010 50.31228665412209 2011 50.297652167633416 2012 50.28381318628715 2013 50.26977942918709 2014 50.254644858559665 2015 50.23400160454081 2016 50.22099371740906 2017 50.21371871501257 2018 50.20239439875697 2019 50.192706886620954 2020 50.183828154759745 2021 50.17671516188637 2022 50.17018774112091 2023 50.16285430300397