Year % of total population 1960 53.2111810551559 1961 53.210995759614 1962 53.207038658434 1963 53.2054802138145 1964 53.201363060518 1965 53.1951549556091 1966 53.1907095181141 1967 53.1888242404504 1968 53.1886347142517 1969 53.2063729594594 1970 53.2791770090203 1971 53.3182146403105 1972 53.2852053047131 1973 53.2406217882837 1974 53.179984908017 1975 53.0964908290498 1976 52.9782146392136 1977 52.8601634650029 1978 52.7688789282883 1979 52.6932582179586 1980 52.6289436294229 1981 52.5693987850819 1982 52.5134865134865 1983 52.4590163934426 1984 52.4102973726545 1985 52.3625513245153 1986 52.3015283027429 1987 52.2201490014738 1988 52.1384187826908 1989 52.0679679552391 1990 52.0037264283357 1991 51.9472858374856 1992 51.8975563800463 1993 51.8551990194472 1994 51.8184935734764 1995 51.7861664387815 1996 51.7573283532218 1997 51.7322755320489 1998 51.7112790797388 1999 51.6991906571349 2000 51.6696203061552 2001 51.6170710384995 2002 51.5671310675304 2003 51.5196784153195 2004 51.4751422787922 2005 51.4329949470037 2006 51.393105405022 2007 51.3571625325245 2008 51.3233501485462 2009 51.2919806075028 2010 51.2633374907938 2011 51.2377171897038 2012 51.2145032346243 2013 51.194697483537 2014 51.1782381251308 2015 51.1627982894264 2016 51.1488579880338 2017 51.136981576486 2018 51.126205728033 2019 51.1162337979801 2020 51.1061341944557 2021 51.095922729501 2022 51.0717643761399 2023 51.0345423703175