Year % of total population 1960 38.8077106216524 1961 38.9812839796796 1962 39.0010664167291 1963 38.8599643471535 1964 38.5929166493845 1965 38.2183652162694 1966 37.7395243131548 1967 37.1554302693646 1968 36.4755187054114 1969 35.7357992942879 1970 34.9744113644101 1971 34.2280167970809 1972 33.5121011713539 1973 32.8004728197138 1974 32.0664147165134 1975 31.3164673092845 1976 30.5584995612111 1977 29.801083384159 1978 29.0584266665957 1979 28.3513115197631 1980 27.7060564500383 1981 27.1598508912777 1982 26.7220759506347 1983 26.359370034445 1984 26.0358113595568 1985 25.7236576369135 1986 25.3989351457638 1987 25.0579915771457 1988 24.7187491913252 1989 24.3799274283988 1990 24.0272896142801 1991 23.6856635570562 1992 24.0682087115193 1993 24.8083905056086 1994 24.9434127256248 1995 24.3237816978787 1996 23.0668385814294 1997 21.9787397832078 1998 21.1609116661511 1999 20.3892763183558 2000 19.6244033163052 2001 18.9032742366265 2002 18.2465385705541 2003 17.6623666240654 2004 17.1573743742246 2005 16.7052854250681 2006 16.2646400624137 2007 15.9795507619935 2008 15.9219671696305 2009 15.9462317065308 2010 15.9283123349553 2011 15.8164338697856 2012 15.6332616113656 2013 15.4070072398276 2014 15.2099897299617 2015 15.0945826774156 2016 15.0226832282577 2017 14.9797080081058 2018 14.9585501020697 2019 14.9405564863274 2020 14.9240411251481 2021 14.9193061450475 2022 14.869276624144 2023 14.7398000060732