Year % of total population 1960 50.9093486261146 1961 50.7734966358826 1962 50.6388368192731 1963 50.5097054797165 1964 50.3849896111413 1965 50.265271197025 1966 50.1501202506983 1967 50.0393481950387 1968 49.9330058967721 1969 49.8279743432757 1970 49.7259102733484 1971 49.6202297455426 1972 49.5153466247899 1973 49.4181871855609 1974 49.3316125361636 1975 49.2583136703699 1976 49.1994676036502 1977 49.1622080273741 1978 49.1388354640677 1979 49.1205624228604 1980 49.112378581926 1981 49.111209998133 1982 49.1139016449059 1983 49.1272421441303 1984 49.1482138369518 1985 49.1675026960774 1986 49.1777056217194 1987 49.1793712765246 1988 49.1797172577138 1989 49.1810221068945 1990 49.1807847702002 1991 49.1648428670642 1992 49.1411988575364 1993 49.1256316643928 1994 49.116195248639 1995 49.1117148284555 1996 49.1045841293035 1997 49.1019699921623 1998 49.1309887284805 1999 49.1836948090762 2000 49.2383248920633 2001 49.2980517828752 2002 49.3643857647427 2003 49.4323089413212 2004 49.498946785347 2005 49.557927799306 2006 49.6020883133996 2007 49.6260573064823 2008 49.6307026325651 2009 49.6316299108078 2010 49.6343670240671 2011 49.6402893730646 2012 49.6566149335516 2013 49.673901851216 2014 49.691852026011 2015 49.713695664055 2016 49.7378433491057 2017 49.7616740349724 2018 49.7774769951026 2019 49.78733167367 2020 49.8015530261038 2021 49.8206231906951 2022 49.833613848465 2023 49.8408811308181