Year % of total population 1960 42.263477636481 1961 42.4886227641397 1962 42.7492572668103 1963 43.0681194981704 1964 43.4338496766649 1965 43.743626406212 1966 43.9870655828427 1967 44.2103591950582 1968 44.4085896648103 1969 44.6107960616582 1970 44.7650142832533 1971 45.022040855032 1972 45.3120862389058 1973 45.4348003251621 1974 45.4952573145893 1975 45.4259531560795 1976 45.2722165600783 1977 45.1577356218334 1978 45.0885347695311 1979 45.0673526073574 1980 45.0844098341298 1981 45.1014020849625 1982 45.0762515315847 1983 44.9839353910581 1984 44.8279110925359 1985 44.6199468796596 1986 44.3554620470466 1987 44.0207600824502 1988 43.6458015661459 1989 43.2752095387335 1990 42.8922786184085 1991 42.4371430970148 1992 41.9278794520846 1993 41.4054603860629 1994 40.8586691447096 1995 40.2819489660699 1996 39.6795481009731 1997 39.069314234545 1998 38.4674341120911 1999 37.8757675526416 2000 37.3087113856894 2001 36.8215146076322 2002 36.4016138652215 2003 36.0071595534802 2004 35.6110609052651 2005 35.2089676132167 2006 34.8620872451798 2007 34.5456952462666 2008 34.2442478069137 2009 33.8792169906768 2010 33.3820231227485 2011 32.8208544612931 2012 32.1953227637443 2013 31.5320567504907 2014 30.8688632776419 2015 30.2012416213687 2016 29.5201438679606 2017 28.8316275779967 2018 28.1708739594383 2019 27.5568240072565 2020 26.9821786730329 2021 26.4529837165562 2022 25.9691585555386 2023 25.5285188917427