Year % of total population 1960 47.898511692567 1961 48.1483419037037 1962 48.3578992154152 1963 48.4777224250123 1964 48.4959234336876 1965 48.4053641470057 1966 48.2570144653253 1967 48.1195258317761 1968 47.9967808660544 1969 47.8866931078711 1970 47.79500459553 1971 47.7259277986902 1972 47.6730685125106 1973 47.6335361415862 1974 47.6037940048628 1975 47.5780505102345 1976 47.552455026008 1977 47.527915488318 1978 47.5199250002677 1979 47.5624480642974 1980 47.5726915041856 1981 47.5151048876749 1982 47.4483992409876 1983 47.3771689775413 1984 47.3048105449979 1985 47.2067282951374 1986 47.055425767851 1987 46.8569851926791 1988 46.5974312292369 1989 46.2590325362007 1990 45.8683316697494 1991 45.4416557986241 1992 44.9844844519255 1993 44.5008420614761 1994 43.9871812611615 1995 43.4441517439165 1996 42.8738912866919 1997 42.2777850116295 1998 41.6643750030154 1999 41.0521600719859 2000 40.4496095963039 2001 39.8522155060388 2002 39.2575079071509 2003 38.6566322165701 2004 38.04995634232 2005 37.448360838165 2006 36.8439050770537 2007 36.228967391348 2008 35.6149380140878 2009 35.0155966276522 2010 34.440219999766 2011 33.8937153778856 2012 33.3894498513997 2013 32.9300326062498 2014 32.5054675510099 2015 32.1101854730211 2016 31.7392849065655 2017 31.3860676396681 2018 31.0461475609696 2019 30.7176822544795 2020 30.4021280376524 2021 30.0778916698538 2022 29.7240714110545 2023 29.350963174274