Year % of total population 1960 73.94854513808528 1961 73.37844035749859 1962 72.85269865651222 1963 72.37801611622312 1964 71.8942641724794 1965 71.67180602839208 1966 71.46030073964553 1967 71.23414009669658 1968 71.01253780770044 1969 70.80217467101367 1970 70.59854145559336 1971 70.38433537536805 1972 70.1272275248666 1973 69.82619033519074 1974 69.47794329782562 1975 69.11700711159313 1976 68.75956527814263 1977 68.3947332283344 1978 67.92597435557315 1979 67.35051535718668 1980 66.76931103293973 1981 66.17622370844961 1982 65.60354378568088 1983 65.08209931940002 1984 64.54623983874242 1985 64.01237320661009 1986 63.48381153780517 1987 62.96292165569605 1988 62.445089739350244 1989 61.94380778064044 1990 61.458558127747324 1991 60.95325210286694 1992 60.45010689809615 1993 59.94578307751968 1994 59.437365753337325 1995 58.92927924541255 1996 58.41892073214449 1997 57.90264018738594 1998 57.37737680141851 1999 56.84643569755099 2000 56.30504446121754 2001 55.71464515554708 2002 55.071816581735305 2003 54.42075763946522 2004 53.759955502903374 2005 53.09279937253502 2006 52.43676910095665 2007 51.78893621096177 2008 51.13553687586149 2009 50.48120194491009 2010 49.830395360650336 2011 49.20629297760482 2012 48.59171157683642 2013 47.968590207733484 2014 47.33766746368165 2015 46.70957161287459 2016 46.090518067216024 2017 45.47674061150685 2018 44.869565127273255 2019 44.27055337389633 2020 43.68259388905527 2021 43.10048094188398 2022 42.53685869507774 2023 41.97573196120786