Year % of total population 1960 45.972 1961 46.28 1962 46.59 1963 46.899 1964 47.21 1965 47.519 1966 47.83 1967 48.14 1968 48.451 1969 48.762 1970 49.037 1971 49.195 1972 49.354 1973 49.512 1974 49.671 1975 49.829 1976 49.988 1977 50.146 1978 50.305 1979 50.463 1980 50.626 1981 50.817 1982 51.008 1983 51.199 1984 51.39 1985 51.581 1986 51.772 1987 51.963 1988 52.154 1989 52.345 1990 52.535 1991 52.729 1992 52.941 1993 53.152 1994 53.363 1995 53.575 1996 53.786 1997 53.997 1998 54.207 1999 54.418 2000 54.602 2001 54.619 2002 54.636 2003 54.653 2004 54.67 2005 54.687 2006 54.704 2007 54.721 2008 54.738 2009 54.755 2010 54.772 2011 54.772 2012 54.754 2013 54.718 2014 54.665 2015 54.594 2016 54.505 2017 54.399 2018 54.276 2019 54.134 2020 53.975 2021 53.799 2022 53.604 2023 53.392