Year % of total population 1960 51.9025226965982 1961 51.8782661734959 1962 51.8565369676786 1963 51.8428637977033 1964 51.8334747848351 1965 51.826329224165 1966 51.8208774312245 1967 51.8126306749361 1968 51.8047132327052 1969 51.799607778765 1970 51.8172907882608 1971 51.6311683520776 1972 51.4347163286273 1973 51.4499973842086 1974 51.4656787420628 1975 51.4487583691883 1976 51.3963496765125 1977 51.3488492917153 1978 51.3094289226454 1979 51.2729923545704 1980 51.2441730296755 1981 51.2290511469374 1982 51.2273196049982 1983 51.2320359282424 1984 51.2340491699515 1985 51.2281717026126 1986 51.2207191271436 1987 51.2145774611222 1988 51.2085953883613 1989 51.2098699107441 1990 51.2202745349966 1991 51.2282151156935 1992 51.2201468073282 1993 51.2028261780368 1994 51.1857309107354 1995 51.1616310593049 1996 51.1359088894448 1997 51.1059943956052 1998 51.0678258709611 1999 51.0325145495054 2000 50.9959465630915 2001 50.9477416366146 2002 50.8832246435149 2003 50.8034543891958 2004 50.7186918916368 2005 50.6256240127302 2006 50.5013975750807 2007 50.3687956120644 2008 50.2242882986386 2009 50.0923958472003 2010 50.0121654838164 2011 49.953519051417 2012 49.9035032719204 2013 49.8519312509352 2014 49.8031040380088 2015 49.7597433947919 2016 49.7290783425343 2017 49.7066942497311 2018 49.6777851620621 2019 49.6411638733513 2020 49.6136914190626 2021 49.5984573961784 2022 49.5712433230374 2023 49.5346022552926