Year % of total population 1960 47.0840861867461 1961 47.3473808502415 1962 47.5578816318871 1963 47.6944690133607 1964 47.7675788083323 1965 47.800048446073 1966 47.8039656776345 1967 47.7804713475527 1968 47.7261560577763 1969 47.6435852135197 1970 47.5416565344911 1971 47.3159887855992 1972 46.9556166364379 1973 46.5368619286704 1974 46.0510057943569 1975 45.5036585145043 1976 44.8999240265277 1977 44.2573859502113 1978 43.59794355644 1979 42.9460317050418 1980 42.3197594887015 1981 41.6016832417153 1982 40.797882608414 1983 40.0429100462825 1984 39.3433950982401 1985 38.7032126221898 1986 38.1263435123642 1987 37.6150230684472 1988 37.1788516052475 1989 36.8326610412845 1990 36.5768257025511 1991 36.3522742009941 1992 36.2015736954999 1993 36.1458505506301 1994 36.1198645580124 1995 36.1355985416851 1996 36.1909071546723 1997 36.2742995004045 1998 36.3708567437539 1999 36.4626510856 2000 36.5327889693841 2001 36.5615328579071 2002 36.532410217493 2003 36.3411111395988 2004 35.9806266105314 2005 35.5405161713235 2006 34.9848193652813 2007 34.3378872907115 2008 33.6676390638467 2009 32.9876686837278 2010 32.3094427765109 2011 31.6496916275882 2012 31.0363645650473 2013 30.6016492723975 2014 30.3258489046285 2015 30.084261440921 2016 29.8826089763097 2017 29.7243898476519 2018 29.0993540535242 2019 28.7798606077223 2020 28.8718543104508 2021 28.7127734545414 2022 28.6142207708302 2023 28.456601714846