Year % of total population 1960 43.19050775623327 1961 43.34955810075703 1962 43.46892285730629 1963 43.54229541764939 1964 43.56203378850832 1965 43.539030691714416 1966 43.488573752935714 1967 43.40570668594571 1968 43.28887733852945 1969 43.14372310475976 1970 42.97187206956322 1971 42.7541403987582 1972 42.4924790970821 1973 42.21283624705513 1974 41.91699767997044 1975 41.60613978975933 1976 41.287684303638436 1977 40.95940379390786 1978 40.62171048660101 1979 40.280597530813885 1980 39.941706958038985 1981 39.6113832764037 1982 39.29768227897338 1983 38.99731049734155 1984 38.69690315513363 1985 38.38822433628625 1986 38.063624199125385 1987 37.72206133439592 1988 37.36941893986867 1989 37.01001686798234 1990 36.6385902397762 1991 36.25299501699454 1992 35.858686937072854 1993 35.45676442103886 1994 35.044538141663686 1995 34.62481608049871 1996 34.19479868855746 1997 33.74951518747055 1998 33.29757078473843 1999 32.84431941571195 2000 32.392080761169005 2001 31.94010744096479 2002 31.482685134534496 2003 31.01939372870305 2004 30.55328875495385 2005 30.08977781171483 2006 29.630035218739806 2007 29.175438077114475 2008 28.723571396925042 2009 28.274415560799675 2010 27.832785049188743 2011 27.40118012625729 2012 26.977176866848424 2013 26.55090048922578 2014 26.13250427946682 2015 25.731508781079093 2016 25.343213959701398 2017 24.964254818988127 2018 24.595485852693493 2019 24.23623211079312 2020 23.8954726904489 2021 23.576186102807707 2022 23.261169349331915 2023 22.934567924223753