Year % of total population 1960 42.8752353233744 1961 42.7050395293557 1962 42.5758547066196 1963 42.5794657322168 1964 42.6698110772434 1965 42.8516177106605 1966 43.13313753769 1967 43.4028417539377 1968 43.66363266817 1969 43.9190522465624 1970 44.152729614081 1971 44.3489423623233 1972 44.5163644389679 1973 44.662194903006 1974 44.7845364763361 1975 44.889375794895 1976 44.9803994004295 1977 45.0332229243747 1978 45.088447125009 1979 45.1869458319881 1980 45.3174769189432 1981 45.4680607390522 1982 45.6182042561941 1983 45.7510055159041 1984 45.8545007791591 1985 45.9352546950995 1986 46.005376355641 1987 45.900659511164 1988 45.8505960428596 1989 45.9862835480016 1990 46.0843017024183 1991 46.15083623101 1992 46.1903806268054 1993 46.2045465867842 1994 46.1919227675202 1995 46.0395178770937 1996 45.7747944625144 1997 45.5523701953013 1998 45.4356393354885 1999 45.3831073034696 2000 45.3526002799619 2001 45.3840279329568 2002 45.4796485399867 2003 45.5950112363826 2004 45.7128326654765 2005 45.8507146853412 2006 45.9862978502599 2007 46.1080105217583 2008 46.264803306257 2009 46.4342162057977 2010 46.5374462879732 2011 46.5751400988268 2012 46.5455067293861 2013 46.4380577437731 2014 46.251996567659 2015 45.993644289993 2016 45.6636098097836 2017 45.2619143929476 2018 44.8011809526444 2019 44.2856626848204 2020 43.7277267247152 2021 43.1556050349974 2022 42.5926620643203 2023 42.0461981417608