Year % of total population 1960 46.4148479514362 1961 45.9760570795116 1962 45.5783162108294 1963 45.3124177075188 1964 45.1241092730404 1965 44.990330459438 1966 44.8753910480087 1967 44.8923592567356 1968 45.0650906419309 1969 45.2861017962793 1970 45.5824362090341 1971 45.9514421220978 1972 46.3729752293298 1973 46.8259273867382 1974 47.3249474513925 1975 47.8690995278978 1976 48.4478550108767 1977 49.0321896708697 1978 49.5846927405341 1979 50.1113224742949 1980 50.6196010418151 1981 51.1363499608881 1982 51.7856607843725 1983 52.5435252046351 1984 53.2841463378073 1985 53.9712280764969 1986 54.53714862757 1987 54.8649961324675 1988 55.0151685259059 1989 55.1415841702107 1990 55.2653015114219 1991 55.3574074842473 1992 55.4250748677116 1993 55.4807950420747 1994 55.4784035307642 1995 55.4107443025237 1996 55.2927628414435 1997 55.1406239935926 1998 54.9707569919894 1999 54.7925207589004 2000 54.6177340115647 2001 54.4332452972565 2002 54.3753800980017 2003 54.4677082471944 2004 54.589562059514 2005 54.771346473975 2006 55.0867706735453 2007 55.4279234347274 2008 55.7003342249475 2009 55.9658032053671 2010 56.2013443159374 2011 56.3860128036017 2012 56.5522097272415 2013 56.7070456489229 2014 56.8228116000932 2015 56.8994525238185 2016 56.9452282722921 2017 56.9634854392078 2018 56.971831321739 2019 56.9947452992018 2020 57.0605710244522 2021 57.1711981861732 2022 57.2116897950374 2023 57.2055246121738