Year	% female
1970	14.90233
1972	17.06033
1973	14.00031
1974	14.73983
1975	15.48466
1976	20.07906
1977	22.05841
1978	23.77138
1979	26.73896
1980	28.04651
1981	26.92621
1982	27.59155
1983	28.0017
1984	29.21126
1985	29.89071
1986	30.11755
1987	30.54012
1988	31.8378
1989	34.64723
1990	35.99635
1991	37.21278
1992	38.28392
1993	38.68216
1994	39.42685
1995	39.89029
1996	40.64692
1999	41.91345
2000	42.62432
2001	44.0934
2002	44.79564
2003	45.39347
2004	45.39808
2005	46.2777
2006	47.40816
2007	48.31049
2008	48.87765
2009	49.46098
2010	50.07351
2011	50.37347
2012	50.42666
2013	50.47247
2014	50.65942
2015	50.77584
2016	50.77176
2017	50.4483
2019	50.61224