Year % of total population 1960 55.2892814473114 1961 55.1325333878861 1962 54.9716338372524 1963 54.8097029713446 1964 54.6541789828952 1965 54.5104380493235 1966 54.372023301138 1967 54.2409711708688 1968 54.1164532685898 1969 54.003913508455 1970 53.9077021315294 1971 53.8195511286093 1972 53.7430916364465 1973 53.6794095441266 1974 53.6266616869403 1975 53.5884264990783 1976 53.55916020458 1977 53.5377081954018 1978 53.5229636586695 1979 53.5172230144211 1980 53.5129619200149 1981 53.5037183405974 1982 53.4981075932613 1983 53.4898019791786 1984 53.4795347742937 1985 53.4642375452362 1986 53.4245765644252 1987 53.3720249695028 1988 53.3274947065267 1989 53.2816692193873 1990 53.2396000393152 1991 53.2146950878006 1992 53.1962435328989 1993 53.1857021107041 1994 53.2024043007447 1995 53.2410041354671 1996 53.2822770635136 1997 53.3221663767565 1998 53.359277259515 1999 53.3911127585457 2000 53.4166438924532 2001 53.4357349212236 2002 53.4582593187355 2003 53.4873758652747 2004 53.51558124874 2005 53.5459458491018 2006 53.575845342137 2007 53.5964533228523 2008 53.6155424095198 2009 53.6403733335738 2010 53.673269089929 2011 53.7161451124711 2012 53.7483382332264 2013 53.759429879074 2014 53.76526023653 2015 53.7682737238456 2016 53.7692403567739 2017 53.776346133799 2018 53.789945804137 2019 53.8173930850113 2020 53.8599339405049 2021 53.9055437225097 2022 53.9560966943312 2023 53.9882239211104