Year % of total population 1960 50.2628908772254 1961 50.3174875943788 1962 50.3675137981159 1963 50.4171545971475 1964 50.4617583610762 1965 50.4975004946961 1966 50.4552457126577 1967 50.3611139536834 1968 50.2995713900284 1969 50.2567768875166 1970 50.2194593497964 1971 50.1848113870213 1972 50.1530972446631 1973 50.1280828750011 1974 50.107498223803 1975 50.0915051531667 1976 50.1163575434595 1977 50.1791549950441 1978 50.2371429905245 1979 50.2851146420049 1980 50.3265504801042 1981 50.3627790422669 1982 50.3950924972411 1983 50.4147494031393 1984 50.4027045988979 1985 50.3807604293794 1986 50.3709009668296 1987 50.3635750825915 1988 50.3590502067969 1989 50.3561481304918 1990 50.3524812669349 1991 50.3478373109225 1992 50.3433554405887 1993 50.3391546536978 1994 50.3362903404858 1995 50.3227207964793 1996 50.2940231481727 1997 50.2603592319188 1998 50.2223382343641 1999 50.1811440399826 2000 50.1394881150061 2001 50.0978127032554 2002 50.0546581470953 2003 50.0088583273869 2004 49.9568072015526 2005 49.9140286459517 2006 49.8845525536273 2007 49.8547549500751 2008 49.8260174263463 2009 49.7972368502066 2010 49.7672110753283 2011 49.7497672337655 2012 49.7308352505906 2013 49.6977244111741 2014 49.664422307285 2015 49.6308503562839 2016 49.5958852840835 2017 49.5602273151553 2018 49.5238640343229 2019 49.4860039335019 2020 49.4405932448881 2021 49.3930577530065 2022 49.3550846111282 2023 49.3250682701698