Year % of total population 1960 86.55027909152635 1961 86.21108130172694 1962 85.86399433872043 1963 85.49863200456439 1964 85.12284385938543 1965 84.7372072962574 1966 84.33607060904916 1967 83.91668279080658 1968 83.42524629439188 1969 82.87074002720762 1970 82.32383488697755 1971 81.97707583307107 1972 81.61536618779613 1973 81.26549000095322 1974 80.9584671018136 1975 80.65689669259541 1976 80.40303607897488 1977 80.13997539998611 1978 79.87017855346883 1979 79.59755112790334 1980 79.28940831600409 1981 78.97124874023126 1982 78.68069903804982 1983 78.35102726738778 1984 77.96003199877634 1985 77.53160506580859 1986 77.10057200753265 1987 76.67901292574227 1988 76.26260432336129 1989 75.86655064262983 1990 75.49452664183629 1991 75.18228157174465 1992 74.86977506297328 1993 74.53783037689794 1994 74.2029017967422 1995 73.90977762444705 1996 73.7224556571401 1997 73.50117490596838 1998 73.25826770202924 1999 73.01740802914772 2000 72.7677142571954 2001 72.51170107515674 2002 72.27324225296391 2003 72.04965623673736 2004 71.80977054846828 2005 71.54050519291361 2006 71.24583148240343 2007 71.00353108514531 2008 70.64727714236341 2009 70.31275585538303 2010 69.95934844518787 2011 69.66446126779378 2012 69.40820134298755 2013 69.17233205654443 2014 68.91833869857908 2015 68.56007525124815 2016 68.16176491640269 2017 67.74348634374314 2018 67.31193016163155 2019 66.86565953716871 2020 66.41459263479506 2021 65.95595525510664 2022 65.47782426651496 2023 64.97987357456316