Year % of female population 1960 0.494229382204448 1961 0.491757428946541 1962 0.489412421442697 1963 0.486844727370292 1964 0.48287449520892 1965 0.476888174938523 1966 0.470025096291501 1967 0.463097272467265 1968 0.455519559926708 1969 0.447815881151958 1970 0.440685453211786 1971 0.433983009527635 1972 0.427885292323096 1973 0.423930210398838 1974 0.423765393702931 1975 0.426594378036598 1976 0.445662486770131 1977 0.479280370311708 1978 0.511414702025022 1979 0.540491546570197 1980 0.565996472721579 1981 0.588318387546884 1982 0.607196246201208 1983 0.622662997364167 1984 0.634763889005402 1985 0.643943199771521 1986 0.650294760872672 1987 0.653360274161021 1988 0.64697066600483 1989 0.620528881424353 1990 0.583920801795236 1991 0.551134275080051 1992 0.521825241812173 1993 0.494762541147021 1994 0.468391052329975 1995 0.44037690964772 1996 0.412868076492273 1997 0.388313534043571 1998 0.366483382489521 1999 0.348829589999961 2000 0.334994299905266 2001 0.320622104151196 2002 0.309128176238334 2003 0.301654723205038 2004 0.294058356758266 2005 0.287516817145173 2006 0.280060636552881 2007 0.272839684604391 2008 0.267642488228156 2009 0.263512750042537 2010 0.259412586569532 2011 0.253706394147265 2012 0.246853349906482 2013 0.241031669828576 2014 0.23464717093115 2015 0.230969299914841 2016 0.232305303405919 2017 0.234632671943414 2018 0.23786850958781 2019 0.242272580178972 2020 0.246149295753555 2021 0.246383582978333 2022 0.247635885309935 2023 0.253464558035535