Year % of total population 1960 48.6856676338081 1961 48.6520874494658 1962 48.6187511197719 1963 48.5878641704617 1964 48.5588483079445 1965 48.5285376518434 1966 48.5010295802541 1967 48.4781911352245 1968 48.4624061154736 1969 48.4558878456327 1970 48.4539786967914 1971 48.4521523462611 1972 48.4484304938692 1973 48.4468608088504 1974 48.4486009859562 1975 48.4330237816164 1976 48.4228419558962 1977 48.4291814054605 1978 48.434175673322 1979 48.4512584365983 1980 48.4888370563914 1981 48.3611414505756 1982 48.2848459165794 1983 48.4087098601331 1984 48.5073156846475 1985 48.586104731165 1986 48.6739182687909 1987 48.7680398816893 1988 48.8534780599306 1989 48.9156382464069 1990 48.9696520726408 1991 49.0201537369245 1992 49.0556712778626 1993 49.0752355057942 1994 49.0936755661749 1995 49.1220903416277 1996 49.153597843112 1997 49.1893162947249 1998 49.224216079246 1999 49.2586159123235 2000 49.2931087626532 2001 49.3266044194085 2002 49.3530890384034 2003 49.3348988272319 2004 49.279800255059 2005 49.2310272829186 2006 49.1967788207379 2007 49.1832166016601 2008 49.1827371450608 2009 49.1838097614477 2010 49.1851491475393 2011 49.1985503157848 2012 49.2241050634811 2013 49.2494467933592 2014 49.2806265982032 2015 49.3161563163289 2016 49.3427712508084 2017 49.3640441196692 2018 49.3866071542658 2019 49.4107772171226 2020 49.4388963030475 2021 49.4710477179735 2022 49.5038913922293 2023 49.5334780852993