Year % of total population 1960 51.5537586005822 1961 51.5145153087323 1962 51.4465080925267 1963 51.3807633656419 1964 51.3298688163069 1965 51.2906760010633 1966 51.2538900793957 1967 51.2164041590472 1968 51.1815687145653 1969 51.1538833193005 1970 51.1472883943593 1971 51.1509391815644 1972 51.15886802319 1973 51.1880800861089 1974 51.2219184424693 1975 51.2560767793468 1976 51.291971500176 1977 51.3207395765883 1978 51.3433837573863 1979 51.3542338914039 1980 51.3533149351816 1981 51.3386849674001 1982 51.3162514755235 1983 51.3021988457271 1984 51.2888792568256 1985 51.270992843082 1986 51.2569792887799 1987 51.2447411571296 1988 51.2298277890706 1989 51.2036036187853 1990 51.1613537746735 1991 51.1466077090758 1992 51.1529381091341 1993 51.1471181082337 1994 51.1456134544359 1995 51.1516351185521 1996 51.1605386996405 1997 51.1631582229881 1998 51.1607193980041 1999 51.1457957340303 2000 51.1332892141376 2001 51.1330278778745 2002 51.1151683231453 2003 51.0857105753057 2004 51.0571318755029 2005 51.0259159567257 2006 50.9923598764416 2007 50.9328281028239 2008 50.8496668363382 2009 50.7925561177621 2010 50.7529560808112 2011 50.7093430373119 2012 50.6607019889846 2013 50.6078915558604 2014 50.5638822485821 2015 50.5238276244631 2016 50.4668515011171 2017 50.4246075369332 2018 50.4146253291763 2019 50.4032259945324 2020 50.385507488297 2021 50.364889179035 2022 50.3409541269625 2023 50.3143178400824