Year % of total population 1960 47.5518279225435 1961 47.750906571187 1962 47.9445681926882 1963 48.1665412724281 1964 48.3757870572707 1965 48.5499561608579 1966 48.7241917397884 1967 48.9203692949396 1968 49.105667031313 1969 49.2434155944912 1970 49.3633972298446 1971 49.4644183680295 1972 49.5474143656731 1973 49.9809896030487 1974 50.3749292557439 1975 50.3766898221144 1976 50.366050612147 1977 50.3385306546995 1978 50.2933507407998 1979 50.2345985420062 1980 50.1632647585804 1981 50.0854397224261 1982 50.0034280089025 1983 49.9208278785612 1984 49.8411619473184 1985 49.7573775984426 1986 49.6700917862191 1987 49.5887700303661 1988 49.5148365776037 1989 49.4474450010667 1990 49.3888522546972 1991 49.3332119992485 1992 49.2794259390212 1993 49.2154483997952 1994 49.1200870241636 1995 48.9839961161118 1996 48.8003385515109 1997 48.5647809691827 1998 48.2985803061962 1999 48.0061823243727 2000 47.6807379472339 2001 47.3335318837502 2002 46.9462478463423 2003 46.4963107863329 2004 45.9918933564539 2005 45.4339180939754 2006 44.826607616794 2007 44.1803437094569 2008 43.5398273769149 2009 42.9546689001738 2010 42.4432116200325 2011 42.003285675022 2012 41.6140774697723 2013 41.2521130161797 2014 40.9187064095454 2015 40.6313275380364 2016 40.3568751077528 2017 40.1367043849574 2018 39.9682221366498 2019 39.7615409831959 2020 39.4767782573281 2021 39.1374845326443 2022 38.7696016359395 2023 38.3592957292836