Year % of total population 1960 49.2660019343909 1961 49.2032140644684 1962 49.1323909464228 1963 49.064406598607 1964 49.0046901814425 1965 48.9523224472444 1966 48.9058476672784 1967 48.8662131752723 1968 48.8303017798042 1969 48.78792209317 1970 48.7292512843508 1971 48.6521893235146 1972 48.5640597031698 1973 48.47789959141 1974 48.4033634232682 1975 48.3414529453758 1976 48.3229847578433 1977 48.3538747825618 1978 48.4092335149937 1979 48.4838866845548 1980 48.5705838645152 1981 48.6648044491865 1982 48.7622482445752 1983 48.8594868590452 1984 48.9534012963803 1985 49.0434385530017 1986 49.1321352081199 1987 49.1971958920047 1988 49.1906371644505 1989 49.1832245872635 1990 49.2200521554858 1991 49.2563465148991 1992 49.2922980385119 1993 49.3277561704142 1994 49.3637611453466 1995 49.4007123352774 1996 49.4378819556833 1997 49.4720892822664 1998 49.507333064716 1999 49.5468831499825 2000 49.5854204279013 2001 49.6198421521527 2002 49.6194306040122 2003 49.5857659979871 2004 49.5462715550467 2005 49.5002929592522 2006 49.4503393488015 2007 49.3982803251639 2008 49.3471025069638 2009 49.2987538980282 2010 49.2521605780898 2011 49.2448052243774 2012 49.2741170753586 2013 49.3021446003492 2014 49.3290420692173 2015 49.355175784656 2016 49.3793823988827 2017 49.4028698307342 2018 49.4259156315599 2019 49.4479349136751 2020 49.4714041845024 2021 49.4956392599834 2022 49.5195440485485 2023 49.5410458076557