Year % of total population 1960 44.991342705817 1961 45.18865093933 1962 45.3468771507294 1963 45.5324878209213 1964 45.6797313107257 1965 45.7053098748394 1966 45.6856026507195 1967 45.6632763284106 1968 45.6257617094158 1969 45.5732258334398 1970 45.4982983663629 1971 45.3731464148935 1972 45.1771678353579 1973 44.9352661682578 1974 44.6983168516413 1975 44.8594939857572 1976 45.2732513610101 1977 45.4878487055636 1978 45.5409896722937 1979 45.4593660205485 1980 45.2607553075758 1981 44.9745889081982 1982 44.6229890519758 1983 44.2181564478862 1984 43.7850644672402 1985 43.3432374636789 1986 42.9045611333119 1987 42.4772058478056 1988 42.0730046762493 1989 41.7038561894466 1990 41.3591704344254 1991 41.0322718011797 1992 40.6760247514235 1993 40.1621766960457 1994 39.4086275357421 1995 38.6126010695089 1996 37.9140521907477 1997 37.2745610136673 1998 36.7256422981373 1999 36.2822435013227 2000 35.9034327569008 2001 35.5624697615738 2002 35.2539282862468 2003 34.9475499763022 2004 34.6331269360313 2005 33.936516575125 2006 32.9050858493363 2007 31.9425010571942 2008 31.0442228155172 2009 30.1778311047827 2010 29.4774800387965 2011 29.0045768051383 2012 28.6105090746023 2013 28.227072836264 2014 27.8612353700623 2015 27.5167689327902 2016 27.1429565170343 2017 26.7159624487633 2018 26.3169684117654 2019 25.9859740719956 2020 26.0410680508446 2021 26.1804835195696 2022 25.946870840637 2023 25.5970920527431