Year % of total population 1960 49.1904970199281 1961 49.2412297025275 1962 49.2890732382413 1963 49.3329861930331 1964 49.3688155905539 1965 49.3932982028538 1966 49.4101685433894 1967 49.4196660484148 1968 49.4230346250329 1969 49.4221194868646 1970 49.4198498185356 1971 49.4145792516071 1972 49.4058897584905 1973 49.3970118657829 1974 49.3873851889895 1975 49.3753562673888 1976 49.3602901845038 1977 49.3421037906085 1978 49.3207335749202 1979 49.2962057633317 1980 49.2658067840856 1981 49.2327596461379 1982 49.1983097903848 1983 49.1559083845098 1984 49.1069289187638 1985 49.0551387024177 1986 49.0009221668672 1987 48.9460401285621 1988 48.8909172498519 1989 48.8351772914317 1990 48.7770333601056 1991 48.7204958689057 1992 48.660178069202 1993 48.5884804509301 1994 48.5104929937137 1995 48.4331198800978 1996 48.3643036569248 1997 48.3064481811802 1998 48.2514174078289 1999 48.2077664129269 2000 48.1826980061353 2001 48.1686924227678 2002 48.1675801680542 2003 48.1743588668432 2004 48.1831626345337 2005 48.1964233640994 2006 48.2174689893274 2007 48.2475076223906 2008 48.2840391806396 2009 48.3231048621858 2010 48.3601287782987 2011 48.3914900048123 2012 48.4191030753929 2013 48.4391347953827 2014 48.4521253730768 2015 48.4653356505788 2016 48.4740010833601 2017 48.4787595503916 2018 48.4906843494514 2019 48.5061818932548 2020 48.5054179039786 2021 48.4957597212145 2022 48.4932142702847 2023 48.4950095824928