Year % of total population 1960 85.43618956908792 1961 85.18859002294245 1962 84.930751011056 1963 84.65202440446711 1964 84.35980520519091 1965 84.05871751601522 1966 83.7448232628573 1967 83.42568963527907 1968 83.10039178083196 1969 82.76548189117818 1970 82.44803320371396 1971 82.12467897401571 1972 81.77946509752086 1973 81.43765801280294 1974 81.12110121836494 1975 80.79879480055287 1976 80.47587527621776 1977 80.13956241811121 1978 79.78490375227915 1979 79.4449778868093 1980 79.12388765219877 1981 78.83430993849262 1982 78.55489416283686 1983 78.21289317178635 1984 77.80746430214491 1985 77.35489479758728 1986 76.85187197896202 1987 76.34035077133044 1988 75.82645064589963 1989 75.31714987938226 1990 74.79720147203274 1991 74.35485395327842 1992 73.92612610304 1993 73.4901768480922 1994 73.05129114280497 1995 72.66471180900908 1996 72.37510266576214 1997 72.08892777625904 1998 71.79662469453174 1999 71.510132150262 2000 71.22722006491185 2001 70.92840919164242 2002 70.61380971736465 2003 70.30158065279943 2004 69.98585189786718 2005 69.65013148988402 2006 69.32393449020634 2007 69.06523360636369 2008 68.65675869716705 2009 68.24247380118176 2010 67.81870901259923 2011 67.38230802985424 2012 66.95952640046285 2013 66.52378831968322 2014 66.06303737282249 2015 65.5744163086867 2016 65.10524743398813 2017 64.64109932493669 2018 64.15240222105258 2019 63.66374063323912 2020 63.17169763063999 2021 62.67630116082473 2022 62.17484192150595 2023 61.66466267542799