Year	% female
1970	40.432
1971	40.42904
1972	40.58646
1973	40.62643
1974	40.56863
1975	40.85187
1976	41.11598
1977	41.37871
1978	41.41645
1979	41.735
1980	41.88002
1981	42.17471
1982	42.34615
1983	42.39255
1984	42.6236
1985	42.96201
1986	43.21566
1987	43.4346
1988	43.55834
1989	43.53261
1990	43.61553
1991	44.06674
1992	44.30919
1993	44.65693
1994	44.81971
1995	44.86518
1996	44.93454
1997	45.17711
1998	45.18787
1999	45.28077
2000	45.38735
2001	45.56138
2002	45.71135
2003	46.95272
2004	46.97435
2005	47.01425
2006	47.12923
2007	47.26141
2008	47.62051
2009	47.75505
2010	47.85237
2011	47.8872
2012	48.03913
2013	48.85592
2014	48.81655
2015	48.87967
2016	49.28962
2017	49.19697
2018	49.13284