Year	% female
1970	40.85178
1971	40.87072
1972	40.86703
1973	40.92376
1974	41.23491
1975	41.54691
1976	41.41965
1977	41.57266
1978	42.0168
1979	42.35538
1980	42.10013
1981	41.75032
1982	41.56919
1983	42.0155
1984	41.6752
1985	41.51952
1986	42.36474
1987	42.62573
1988	42.8127
1989	43.05491
1990	43.30983
1991	43.57236
1992	43.88907
1993	44.09419
1994	44.48269
1995	44.75125
1996	44.99948
1997	45.43261
1998	45.87488
1999	46.27702
2000	46.42294
2001	46.53652
2002	46.75798
2003	47.17292
2004	47.18527
2005	47.30455
2006	47.40585
2007	47.51877
2008	47.71433
2009	48.02889
2010	48.05869
2011	48.12813
2012	48.20367
2013	48.60113
2014	48.67732
2015	48.58576
2016	48.64858
2017	48.67881
2018	48.74719