Year % of total population 1960 85.3781707081316 1961 85.07257007930369 1962 84.75755870377766 1963 84.42256401261038 1964 84.07254968971968 1965 83.71030575846503 1966 83.34933128504042 1967 82.9792848715492 1968 82.60025306431567 1969 82.21070807262211 1970 81.83181008599362 1971 81.42090584175074 1972 80.99086780656178 1973 80.55883513788253 1974 80.1371982885646 1975 79.70818225819791 1976 79.27231072629168 1977 78.84348729823714 1978 78.40383288385661 1979 78.00935057291402 1980 77.62266663565886 1981 77.20547897178393 1982 76.7961604894019 1983 76.34834601844737 1984 75.8512494445728 1985 75.30915925064652 1986 74.74095423198993 1987 74.17181941382118 1988 73.6036290702661 1989 73.0428182111904 1990 72.49205934754193 1991 72.0528527983671 1992 71.62333829988927 1993 71.1928813702482 1994 70.76651002845665 1995 70.37320348923562 1996 70.03671512033988 1997 69.68189204034643 1998 69.31719273355289 1999 68.95480815769034 2000 68.59279117840501 2001 68.16638558600488 2002 67.72954183094691 2003 67.29043789418701 2004 66.84633746640381 2005 66.38626178283269 2006 65.9287612496336 2007 65.51326216229279 2008 65.0101313021719 2009 64.50215339598203 2010 63.98658730907545 2011 63.464647509551405 2012 62.953090561567834 2013 62.439725598129876 2014 61.91250374929115 2015 61.37023395581927 2016 60.8406195764976 2017 60.31429673031598 2018 59.77691335402801 2019 59.24214128837291 2020 58.706973867980864 2021 58.17130372010019 2022 57.63328981147173 2023 57.091297585549036