Year % of total population 1960 46.7888189448441 1961 46.789004240386 1962 46.792961341566 1963 46.7945197861855 1964 46.798636939482 1965 46.8048450443909 1966 46.8092904818859 1967 46.8111757595496 1968 46.8113652857483 1969 46.7936270405406 1970 46.7208229909797 1971 46.6823494900262 1972 46.7147946952869 1973 46.7599134977732 1974 46.8205355051911 1975 46.9035091709501 1976 47.0217853607864 1977 47.1398365349971 1978 47.2311210717117 1979 47.3062988847847 1980 47.3710563705771 1981 47.4306012149181 1982 47.4865134865135 1983 47.5405974241634 1984 47.5897026273454 1985 47.6370878704566 1986 47.6984716972572 1987 47.7801890236482 1988 47.8619089443257 1989 47.9320320447609 1990 47.9959650924975 1991 48.0530136067459 1992 48.1021528512776 1993 48.1448009805527 1994 48.1815064265236 1995 48.2138335612185 1996 48.2426716467782 1997 48.2677244679511 1998 48.2887209202612 1999 48.3010478759819 2000 48.3303796938448 2001 48.3829289615005 2002 48.4328689324696 2003 48.4805384028308 2004 48.5248577212077 2005 48.5670050529964 2006 48.606894594978 2007 48.6430356367874 2008 48.6766498514538 2009 48.7082088463586 2010 48.7364774590392 2011 48.7622828102962 2012 48.7853206355469 2013 48.805130802847 2014 48.8219292739067 2015 48.8373649332419 2016 48.8509828021563 2017 48.8628630557118 2018 48.873794271967 2019 48.8837662020199 2020 48.8938658055443 2021 48.904077270499 2022 48.9280975543752 2023 48.9655926874331