Year % of total population 1960 45.7576397275266 1961 46.3202810344364 1962 46.8786077689744 1963 47.404984840697 1964 47.9155080759339 1965 48.4247217696634 1966 48.896010682406 1967 49.3087710524102 1968 49.6683115719968 1969 49.9635679475679 1970 50.1977205867953 1971 50.3821228067013 1972 50.516985406388 1973 50.5976954459157 1974 50.6221189772621 1975 50.5925891374913 1976 50.5035367616024 1977 50.3610219914252 1978 50.1677537716809 1979 49.9304047841098 1980 49.6622202996206 1981 49.3674716488873 1982 49.0530569449936 1983 48.7268198420899 1984 48.4015696939036 1985 48.0750988918012 1986 47.7348245485188 1987 47.3721213496295 1988 46.9891065674958 1989 46.5897744275517 1990 45.7966572879804 1991 44.6471436804542 1992 43.5220962595886 1993 42.5032245527766 1994 41.7013855937334 1995 41.1739167981661 1996 40.9007425235298 1997 40.7824170066957 1998 40.6850131997689 1999 40.5379299743909 2000 40.33229473511 2001 40.0621887897492 2002 39.7497484376693 2003 39.4116861635585 2004 39.0290474896804 2005 38.6318072030733 2006 38.2538547754166 2007 37.8849614576077 2008 37.4907779397237 2009 37.0803743238415 2010 36.6474861671946 2011 36.2102169211599 2012 35.7832157932007 2013 35.4659644794533 2014 35.3181660577134 2015 35.071814282471 2016 34.7014655950725 2017 34.330489761934 2018 33.9282660948174 2019 33.4992665219043 2020 33.0584933040197 2021 32.6090779494859 2022 32.0942114468195 2023 31.5031530461732