Year % of total population 1960 85.29460934271707 1961 84.90987676687527 1962 84.51592448289631 1963 84.1024080500838 1964 83.67079214597618 1965 83.22135030084081 1966 82.79204428180545 1967 82.34752006410169 1968 81.8890484766259 1969 81.41799514612484 1970 80.94728084048597 1971 80.4066221081484 1972 79.8502459614112 1973 79.28367903471383 1974 78.7050574523807 1975 78.11687560757156 1976 77.5123370330968 1977 76.9460168482495 1978 76.37922481927635 1979 75.89966828945575 1980 75.41490621691186 1981 74.80742224420347 1982 74.20219319872483 1983 73.59156749959084 1984 72.9507090762096 1985 72.26887724138938 1986 71.59500774561226 1987 70.92935931142402 1988 70.27453034508565 1989 69.63454431566863 1990 69.02945889030123 1991 68.58967038824017 1992 68.1625087996321 1993 67.74087371452775 1994 67.33373049202511 1995 66.93271719050152 1996 66.52592561372559 1997 66.07219367047803 1998 65.60670688561652 1999 65.13648196497498 2000 64.66295062170438 2001 64.05509197770631 2002 63.44511861893162 2003 62.826687119275306 2004 62.20102321623577 2005 61.56551623249665 2006 60.92069637713616 2007 60.278402320766205 2008 59.63946466910563 2009 58.998488247891196 2010 58.352842095253436 2011 57.71170082500166 2012 57.074115022237685 2013 56.445906111496576 2014 55.81982499088795 2015 55.1941367422783 2016 54.57493362363795 2017 53.960522175717266 2018 53.3505741713724 2019 52.74458678361948 2020 52.142168975221985 2021 51.545193730082055 2022 50.95261545136859 2023 50.36459029720689