Year % of total population 1960 39.0454523915716 1961 39.4290043111484 1962 39.739317198547 1963 40.019489598408 1964 40.4106379007701 1965 40.804711985435 1966 41.1471066526233 1967 41.4912836004494 1968 41.831883036154 1969 42.1613376661886 1970 42.4803067635974 1971 42.7908440025048 1972 43.0828558792804 1973 43.3515110260666 1974 43.5965019511247 1975 43.8163926802834 1976 44.0613764559289 1977 44.3346490398335 1978 44.5471635269407 1979 44.7295534784806 1980 44.764055974187 1981 44.7352081447513 1982 45.1232929950372 1983 45.5999112185732 1984 45.7792945848169 1985 45.8836161382796 1986 45.9860322334899 1987 46.0903585996977 1988 46.2041941627237 1989 46.3106519104767 1990 46.3852300682734 1991 46.436956662111 1992 46.4586919294796 1993 46.4342869050314 1994 46.3659876506578 1995 46.2540118482574 1996 46.0837268445205 1997 45.8570583080444 1998 45.6264595894883 1999 45.4298711889599 2000 45.2421544986516 2001 45.0319019511267 2002 44.8051289072984 2003 44.603009014251 2004 44.4414041494742 2005 44.3086364907368 2006 44.1957554454011 2007 44.0817914179295 2008 43.970396676672 2009 43.8782456317976 2010 43.8057954064024 2011 43.7509979156309 2012 43.6986026129618 2013 43.6295263915758 2014 43.4590284976155 2015 43.2562721545303 2016 43.1357312846059 2017 43.064007456346 2018 42.9663453351096 2019 42.8070806293346 2020 42.625165638261 2021 42.4305134067792 2022 42.2108280393622 2023 41.9528504839881