Year % of total population 1960 38.73260622900189 1961 38.84656951075448 1962 39.01326378539493 1963 39.22418437767515 1964 39.461980624215045 1965 39.75919517454697 1966 40.10305657305657 1967 40.4818556503885 1968 40.907750640239954 1969 41.350116194733495 1970 41.59433558316915 1971 41.41047091172632 1972 41.31589358539467 1973 41.276580513333556 1974 41.26291769150916 1975 41.22788079991481 1976 41.21673722108836 1977 41.19040496914715 1978 41.15137722667745 1979 41.103351180822465 1980 41.13373352404005 1981 41.189116906208326 1982 41.26203294426411 1983 41.35648097454147 1984 41.4773179264285 1985 41.59417965400716 1986 41.701698225566666 1987 41.82777963506391 1988 41.9546738432468 1989 42.07098481073175 1990 42.14996214291151 1991 42.24918116380281 1992 42.33275532719462 1993 42.44831389779124 1994 42.60931910947607 1995 42.79110178084558 1996 42.99150463633192 1997 43.17863322782837 1998 43.38952018096529 1999 43.61453375860091 2000 43.79137552804651 2001 43.80948022917093 2002 43.85989929609539 2003 43.944977540479734 2004 44.006475934735306 2005 44.073144601938246 2006 44.12657746209135 2007 44.19076174932964 2008 44.26293812090964 2009 44.369565338640015 2010 44.50312981424977 2011 44.68818037243765 2012 44.876905576032996 2013 45.08868692558504 2014 45.289273397162724 2015 45.49497183993786 2016 45.713255558351115 2017 45.98061193792383 2018 46.304526050824315 2019 46.47373339099525 2020 46.40937543376001 2021 46.729972307669534 2022 46.963034281989465 2023 47.147370080390125