Year % of total population 1960 43.120328608696134 1961 43.41979172373349 1962 43.65263714194344 1963 43.851593600799795 1964 43.98257502123949 1965 44.071659155774434 1966 44.167272258613224 1967 44.248311103873235 1968 44.289622583984276 1969 44.30411774451186 1970 44.3088050009519 1971 44.3062780851245 1972 44.30027779357781 1973 44.28131253000523 1974 44.23912924142188 1975 44.219546456734996 1976 44.23962512097548 1977 44.222240820752184 1978 44.17341387639207 1979 44.13784966077976 1980 44.103938060826096 1981 43.951091239441 1982 43.81801511435589 1983 43.80967603764298 1984 43.78424916978038 1985 43.739035399637366 1986 43.67329891886788 1987 43.581470253742616 1988 43.453486587677 1989 43.267697139571816 1990 42.912448287930665 1991 42.49493364426684 1992 42.13858403409942 1993 41.826571538705124 1994 41.411135737045534 1995 40.80539089281099 1996 40.097443604396666 1997 39.290679011260515 1998 38.444116938422106 1999 37.59612955086813 2000 36.74785737356921 2001 35.915496426469964 2002 35.15536513663669 2003 34.43928332855899 2004 33.74337660132237 2005 33.11542122321262 2006 32.51607208269132 2007 31.95354328643742 2008 31.544392408876565 2009 31.280407686536886 2010 31.103793023749965 2011 31.054998035724903 2012 31.11534570193091 2013 31.248289115280084 2014 31.4284119152029 2015 31.585395635511002 2016 31.63835559127083 2017 31.612425613224026 2018 31.535290192016284 2019 31.381866587396047 2020 31.184142177967264 2021 30.954137443484946 2022 30.665152698141025 2023 30.311317626166765