Year % of total population 1960 42.642005429928105 1961 42.80205832529502 1962 42.958633468684795 1963 43.13338341258982 1964 43.319067357661424 1965 43.47646273802611 1966 43.60400293481363 1967 43.72036593124193 1968 43.82556243231697 1969 43.92869262077635 1970 44.03439774555658 1971 44.16673262878632 1972 44.30215731840278 1973 44.39199090063846 1974 44.443392190789325 1975 44.465396787413205 1976 44.4738133581244 1977 44.47959040156739 1978 44.485676618929354 1979 44.50340295338457 1980 44.55085884374256 1981 44.605314287232474 1982 44.629789375923465 1983 44.626572238149166 1984 44.61645108029867 1985 44.60278400449694 1986 44.56990146910438 1987 44.51404020490882 1988 44.436776573896964 1989 44.362033470306386 1990 44.2904979084993 1991 44.18999394304108 1992 44.06714526604725 1993 43.95356482333965 1994 43.78864322320806 1995 43.59578723131345 1996 43.449503980912816 1997 43.29752710535944 1998 43.09079507170372 1999 42.86363531685998 2000 42.65000357544276 2001 42.44438374147637 2002 42.255915576074585 2003 42.07237114265439 2004 41.8793966103004 2005 41.68177148065222 2006 41.48914692344696 2007 41.31439416882932 2008 41.15878071485796 2009 40.99249362518109 2010 40.803557169214656 2011 40.601458040055824 2012 40.41185315907088 2013 40.24814819307416 2014 40.0733601879947 2015 39.869831519125434 2016 39.628520903709685 2017 39.35978943141199 2018 39.07932491644166 2019 38.79031266911372 2020 38.499035061385186 2021 38.21584207359467 2022 37.94342911495947 2023 37.66722450046292