Year % of total population 1960 42.974223451851856 1961 43.25307720061773 1962 43.46294205806653 1963 43.64443991468155 1964 43.7616772523817 1965 43.83803880068059 1966 43.92368595470901 1967 43.99286328928949 1968 44.02925119274526 1969 44.03923985228822 1970 44.03994578801637 1971 44.031716321920925 1972 44.014366949965876 1973 43.97732233592809 1974 43.92089728279359 1975 43.90418086768039 1976 43.93413996826511 1977 43.916844730197795 1978 43.86179112501601 1979 43.81238648327862 1980 43.76144918570784 1981 43.60454404428221 1982 43.46424556614683 1983 43.432744946864595 1984 43.38682386790011 1985 43.31755134892211 1986 43.22774493291353 1987 43.11374996017139 1988 42.96239883826324 1989 42.75531199675745 1990 42.451841422905225 1991 42.029039656585454 1992 41.6562182069471 1993 41.313242544961184 1994 40.868477287759426 1995 40.260775847195 1996 39.5695199057712 1997 38.79141152773635 1998 37.977810699870155 1999 37.167813128845644 2000 36.36268819416997 2001 35.57663689088452 2002 34.859327747557586 2003 34.183058069056486 2004 33.523552834600466 2005 32.88561732467829 2006 32.21972741562223 2007 31.56884156651905 2008 31.05622299227619 2009 30.686986470932148 2010 30.444038473450007 2011 30.34960263603385 2012 30.34952544390397 2013 30.414617944209148 2014 30.53187159136436 2015 30.629299207982314 2016 30.63553782085933 2017 30.579318605718154 2018 30.48749055648817 2019 30.347379214737828 2020 30.22144677960907 2021 30.06608913412839 2022 29.80294034293261 2023 29.4660239828288