Year % of total population 1960 48.0883633427023 1961 48.1290598682501 1962 48.1736669275774 1963 48.2177663433316 1964 48.2621081496193 1965 48.3068576500086 1966 48.3480441628916 1967 48.3884795298696 1968 48.4302698060105 1969 48.4696620191752 1970 48.5054953215506 1971 48.5401290893204 1972 48.5740906597618 1973 48.6058407175694 1974 48.6360160337112 1975 48.6692308839095 1976 48.7085457317002 1977 48.7500104121517 1978 48.7906691256193 1979 48.8310526603677 1980 48.8691103646529 1981 48.906376220181 1982 48.9487911742875 1983 48.9908264833442 1984 48.9389654027804 1985 48.7910014927973 1986 48.6300884270534 1987 48.4611062978008 1988 48.2871568889722 1989 48.1825857863007 1990 48.2099030339493 1991 48.2909247426109 1992 48.367079439979 1993 48.4495077571754 1994 48.5185597988918 1995 48.5658298480394 1996 48.6040862857957 1997 48.6354214283091 1998 48.6633785214239 1999 48.6886725336863 2000 48.712124497131 2001 48.7328172313088 2002 48.7478019615883 2003 48.7589292114095 2004 48.7740021490975 2005 48.7912069713856 2006 48.8061355668281 2007 48.8243295359984 2008 48.8443086271131 2009 48.8630119401524 2010 48.8845820414919 2011 48.907396814602 2012 48.9313115350811 2013 48.9589408975516 2014 48.9875597157892 2015 49.0191682812114 2016 49.0481945147624 2017 49.0703467798547 2018 49.0892415096729 2019 49.1020286882103 2020 49.1072976684056 2021 49.1051654453921 2022 49.0982672367287 2023 49.091472198834