Year % of total population 1960 46.96090860067549 1961 47.56988558352403 1962 46.66511120802442 1963 46.3040773434216 1964 45.82234343434343 1965 45.55263363246196 1966 45.719627234689995 1967 45.08032786885246 1968 45.45315733143061 1969 45.59054570733403 1970 45.407061197041024 1971 45.302443792766375 1972 45.476016518424395 1973 44.98367907260525 1974 44.97885697364525 1975 45.287554269175104 1976 45.62473818284744 1977 45.958870744533634 1978 46.3589701897019 1979 46.54944532488114 1980 46.822227952552865 1981 47.28733569261881 1982 47.81448772016869 1983 48.37744214372716 1984 49.17335898052416 1985 49.72263170328372 1986 50.389602233077454 1987 51.03138017853056 1988 51.66233678523188 1989 52.27698096502878 1990 52.16714592274678 1991 50.55881996362902 1992 51.16363458910794 1993 53.11978711271621 1994 55.211020559362844 1995 57.35704238052299 1996 58.39618763176387 1997 58.279952021932836 1998 58.28943225590353 1999 58.14829387755102 2000 57.95423755764032 2001 57.92259667650256 2002 58.09226788432268 2003 58.18171218440289 2004 58.09170215890733 2005 58.00271280356705 2006 57.912996016275144 2007 57.81933399256278 2008 57.72753393169877 2009 57.2814203270279 2010 57.161878902355845 2011 57.03111076772516 2012 56.90368497566526 2013 56.94838389478255 2014 57.15290236985284 2015 57.32559277335593 2016 57.51544582260707 2017 57.717558215601436 2018 57.93015715765299 2019 57.85075104926 2020 57.82803225141344 2021 57.82221439699511 2022 57.62525765105938 2023 57.34811975360522