Year % of total population 1960 49.224 1961 49.239 1962 49.254 1963 49.27 1964 49.285 1965 49.3 1966 49.315 1967 49.33 1968 49.346 1969 49.361 1970 49.376 1971 49.391 1972 49.407 1973 49.422 1974 49.437 1975 49.452 1976 49.468 1977 49.483 1978 49.498 1979 49.513 1980 49.528 1981 49.544 1982 49.559 1983 49.574 1984 49.589 1985 49.605 1986 49.62 1987 49.635 1988 49.65 1989 49.665 1990 49.681 1991 49.696 1992 50.002 1993 50.412 1994 50.823 1995 51.233 1996 51.644 1997 52.054 1998 52.464 1999 52.873 2000 53.283 2001 53.661 2002 54.028 2003 54.394 2004 54.76 2005 55.125 2006 55.489 2007 55.853 2008 56.217 2009 56.579 2010 56.941 2011 57.06 2012 57.043 2013 57.01 2014 56.959 2015 56.892 2016 56.808 2017 56.707 2018 56.589 2019 56.454 2020 56.303 2021 56.134 2022 55.948 2023 55.746