Year % of total population 1960 5.24080609221978 1961 5.61318712172591 1962 5.99761507410921 1963 6.12894006111234 1964 6.02123880338799 1965 5.95125091208895 1966 5.91273742307501 1967 5.89068408617281 1968 5.88074419368249 1969 5.8107421662954 1970 5.67479429112216 1971 5.54440077091026 1972 5.42891719712531 1973 5.32710883518142 1974 5.23888865213506 1975 5.1625455217318 1976 5.08994107258297 1977 5.01114138107339 1978 4.9255260949533 1979 4.85218842461423 1980 4.78251010142657 1981 4.69868406602726 1982 4.60248838672419 1983 4.4991092811399 1984 4.40568011574801 1985 4.32133251134852 1986 4.23107732731208 1987 4.13081563382466 1988 4.02288873747391 1989 3.92231889060127 1990 3.83477072849355 1991 3.75057412776328 1992 3.66562657123752 1993 3.58455216387707 1994 3.52149164646435 1995 3.48557406053683 1996 3.46709189052508 1997 3.45133863596907 1998 3.43612878788981 1999 3.41935052167244 2000 3.42434524646167 2001 3.45342819160876 2002 3.48354006175295 2003 3.51836423760662 2004 3.571702977483 2005 3.64891345332919 2006 3.72572583275803 2007 3.77975800982713 2008 3.80745191280949 2009 3.81315946132176 2010 3.80739087962346 2011 3.79848301938364 2012 3.79109129983394 2013 3.79396050160387 2014 3.80438349227347 2015 3.83906088492835 2016 3.8797948675292 2017 3.92996901353815 2018 4.01394947077915 2019 4.12313710167538 2020 4.26028318310069 2021 4.41871597094495 2022 4.6106717169369 2023 4.84738653437986