Year % of total population 1960 43.7083829300774 1961 44.0472150158476 1962 44.3872746838849 1963 44.649177653935 1964 44.8813975964367 1965 45.1337478274529 1966 45.3422434274205 1967 45.4879947167319 1968 45.5684389269017 1969 45.5853536374261 1970 45.541451249666 1971 45.4278179971828 1972 45.1261896383341 1973 44.6509477930671 1974 44.1240792322071 1975 43.5447998684145 1976 42.9143921970684 1977 42.2391490361223 1978 41.5595903619943 1979 40.8821730164036 1980 40.2141920576558 1981 39.5954219264382 1982 39.0079871517272 1983 38.4014320702183 1984 37.813820667664 1985 37.3419661634995 1986 36.9770001014587 1987 36.673253545739 1988 36.4823535243383 1989 36.3741764332844 1990 36.2831879368704 1991 36.1876779758962 1992 36.0484653106943 1993 35.9044675244564 1994 35.7120896689242 1995 35.3608717349366 1996 34.8540960674181 1997 34.2382198460061 1998 33.5393318566217 1999 32.8015039238963 2000 32.0413905239372 2001 31.2745786103847 2002 30.5189329988905 2003 29.6976317814361 2004 28.8572690654807 2005 28.0779681213903 2006 27.4073211810797 2007 26.9425097285007 2008 26.5128306574208 2009 26.0441224659694 2010 25.6654615417142 2011 25.3285097567003 2012 25.0052340674985 2013 24.7363140206644 2014 24.4453605544497 2015 24.0714973593752 2016 23.6649673044527 2017 23.245179818616 2018 22.8560964095086 2019 22.500354500488 2020 22.1183129940265 2021 21.7092279760025 2022 21.2655781166845 2023 20.7665647364681