Year % of total population 1960 44.9859413804798 1961 45.4920699254456 1962 46.0538011695906 1963 46.6534158726305 1964 47.2571041150808 1965 47.834505782759 1966 48.3662156909922 1967 48.8237247668543 1968 49.1900718484651 1969 49.4045452621778 1970 49.3387370249369 1971 49.125443777368 1972 48.9460553041086 1973 48.7771428571429 1974 48.6071373036853 1975 48.3234073133997 1976 47.9263363339739 1977 47.5107025105924 1978 47.108128047793 1979 46.7493045933854 1980 46.4001984386735 1981 45.9607163023312 1982 45.5125534336996 1983 45.2019506193409 1984 45.0496645723963 1985 44.9764893398965 1986 44.8665153431843 1987 44.7116621827114 1988 44.5373031876099 1989 44.3519526342445 1990 44.1441046719554 1991 43.9710074197623 1992 43.7765206950097 1993 43.4941921396255 1994 43.1401701475687 1995 42.6960082335862 1996 42.1655972035904 1997 41.5849518922977 1998 41.00339251335 1999 40.4458318205157 2000 39.9278720165054 2001 39.4877861503147 2002 39.1146816049253 2003 38.7518087258237 2004 38.3886656487652 2005 38.0103432902363 2006 37.5964354179258 2007 37.1473230284665 2008 36.6653417148802 2009 36.1359516568233 2010 35.4503867509659 2011 34.664643629329 2012 33.9182457670615 2013 33.1873073436083 2014 32.4689571004868 2015 31.7736077650047 2016 31.1098859962566 2017 30.4970595967104 2018 29.9446954191161 2019 29.3712332463794 2020 28.7764246221708 2021 28.2356867342781 2022 27.7391138061428 2023 27.2597821456825