Year	% female
1970	35.26393
1971	35.32274
1972	35.54895
1973	35.86441
1974	36.03693
1975	36.09127
1976	36.17733
1977	35.70633
1978	35.70069
1979	35.87042
1980	36.04689
1981	35.97282
1982	36.59827
1983	36.04524
1984	35.98024
1985	37.10761
1986	38.77574
1987	39.12737
1988	39.34074
1989	39.49446
1990	39.59129
1991	40.02344
1992	40.35768
1993	40.72298
1994	40.99073
1995	41.82286
1996	42.32149
1997	42.87114
1998	43.35527
1999	43.86483
2000	44.10681
2001	44.25777
2002	44.25682
2003	44.60521
2004	44.10007
2005	44.61047
2006	44.57814
2007	44.47873
2008	45.02485
2009	45.26064
2010	45.56983
2011	45.73255
2012	45.97823
2013	45.97985
2014	46.23953
2015	46.57627
2016	46.66398
2017	46.93841
2018	47.09857