Year	% female
1970	36.93688
1971	36.89947
1972	37.2019
1973	37.52334
1974	37.73881
1975	38.18135
1976	38.6315
1977	39.13517
1978	39.58814
1979	40.4898
1980	40.96338
1981	41.41912
1982	41.73224
1983	42.06239
1984	42.51103
1985	42.93031
1986	43.33733
1987	43.63393
1988	43.74136
1989	44.18357
1990	44.50845
1991	44.64385
1992	44.99044
1993	45.17659
1994	45.22874
1995	45.46099
1996	44.7607
1997	45.49606
1998	45.67317
1999	45.89349
2000	46.11088
2001	46.35268
2002	46.55465
2003	46.70846
2004	46.82009
2005	46.85894
2006	46.91803
2007	47.0442
2008	47.14302
2009	47.19419
2010	47.27571
2011	47.17871
2012	47.45646
2013	47.65378
2014	47.8235
2015	47.96047
2016	47.9655
2017	47.97977
2018	48.00201