Year % of female population 1960 0.295290581102478 1961 0.290650023177973 1962 0.285897734490178 1963 0.281532523084701 1964 0.277925284688337 1965 0.274698763828456 1966 0.271891599939172 1967 0.269804497683354 1968 0.267944818191375 1969 0.265951003140347 1970 0.263613470059114 1971 0.261374864930156 1972 0.25963963596987 1973 0.257988648499466 1974 0.256634365902283 1975 0.255601314025091 1976 0.254715886554293 1977 0.254190010422996 1978 0.253962551933502 1979 0.254142566940491 1980 0.254905141169627 1981 0.256261358772008 1982 0.258174626914188 1983 0.260627634023799 1984 0.263840892911077 1985 0.267927314296602 1986 0.272448084530824 1987 0.277136634049608 1988 0.282140800088762 1989 0.2873596597197 1990 0.292090607824326 1991 0.296180538863764 1992 0.299770801955894 1993 0.302371670644321 1994 0.303480620844642 1995 0.303134364690775 1996 0.301765957665907 1997 0.300247247137452 1998 0.298615027755465 1999 0.296099790745234 2000 0.293126179160344 2001 0.289777188502599 2002 0.286120872002165 2003 0.282975934439829 2004 0.280215578587333 2005 0.277329538401828 2006 0.275558745444063 2007 0.274070147478203 2008 0.271928428720451 2009 0.269667567435268 2010 0.26723853061314 2011 0.265547416000534 2012 0.264623689398614 2013 0.264416611182973 2014 0.264796116213504 2015 0.265555163672612 2016 0.2669338582801 2017 0.26919003921387 2018 0.272008406987709 2019 0.275159226350132 2020 0.278686777707201 2021 0.282715567276676 2022 0.287128192000247 2023 0.291876341723223