Year % of total population 1960 42.3218429328224 1961 42.1542158935976 1962 42.022502007822 1963 41.992139005617 1964 42.0274084541544 1965 42.2159254514642 1966 42.5540386580652 1967 42.870549855899 1968 43.1589068139768 1969 43.4168721179885 1970 43.6486641503267 1971 43.8515993305947 1972 44.0156991432593 1973 44.1471642366801 1974 44.2635101882544 1975 44.3773274876333 1976 44.4838756343329 1977 44.5671546275775 1978 44.6257716270375 1979 44.6664252118487 1980 44.6882549654505 1981 44.7003120691588 1982 44.7191977592815 1983 44.7475559286804 1984 44.7825726125375 1985 44.8271087025485 1986 44.8673492129073 1987 44.9199404805796 1988 44.991850048695 1989 45.0782455807356 1990 45.2013293270572 1991 45.2214817430194 1992 45.3053192535941 1993 45.0738473099715 1994 44.9004161566708 1995 43.9443951139904 1996 43.3491668887958 1997 44.0079055281531 1998 44.4924741260749 1999 44.8140263652109 2000 44.9924661897935 2001 44.6746683948526 2002 44.1863427525218 2003 43.5182081190085 2004 42.9229686014767 2005 42.8986570763052 2006 43.1055524943118 2007 43.2868931802434 2008 43.0451140952146 2009 42.7906590641424 2010 42.6511098325871 2011 42.4188560187307 2012 42.2325428672974 2013 42.0904134764121 2014 42.1219224143767 2015 42.217334340118 2016 42.1730238501168 2017 41.9858001320603 2018 41.5632466078796 2019 41.0316283956468 2020 40.4249539071754 2021 39.7818751533017 2022 39.196556815543 2023 38.6553767817053