Year % of total population 1960 81.72173361505469 1961 81.51248432450403 1962 81.26638390991042 1963 81.014835374292 1964 80.75708290084735 1965 80.49559545556957 1966 80.23205013029346 1967 79.95593103692612 1968 79.67250821222348 1969 79.38462277980956 1970 79.09137245075554 1971 78.7559579983031 1972 78.36677479481064 1973 77.98175601858868 1974 77.58597328616325 1975 77.32885212584054 1976 76.90128374518589 1977 76.47724999639595 1978 76.07446864751113 1979 75.68069042305112 1980 75.25728563505012 1981 74.85033415268286 1982 74.5418649082443 1983 74.2270762717359 1984 73.9035300075886 1985 73.57255874267656 1986 73.23571201157984 1987 72.89803951161035 1988 72.55977611659418 1989 72.21909184151089 1990 71.82445377151929 1991 71.53385439605695 1992 71.26314126425632 1993 70.99879402151345 1994 70.73222795663762 1995 70.47221103688022 1996 70.20671730516099 1997 69.9359975759737 1998 69.6658624473779 1999 69.39769961397286 2000 69.12118863649155 2001 68.7932861550277 2002 68.41823770739958 2003 68.0371246216582 2004 67.65162852612195 2005 67.2569205243247 2006 66.85347315855296 2007 66.44505697067933 2008 66.03632139418482 2009 65.62319816929632 2010 65.20308405732052 2011 64.7736859289806 2012 64.34262827069718 2013 63.89048484545231 2014 63.4192546523081 2015 62.954214454463134 2016 62.495356203678675 2017 62.032280193596314 2018 61.55896459071151 2019 61.07530007386998 2020 60.58182106241586 2021 60.07809609256743 2022 59.56253129355517 2023 59.03933970344681