Year	% female
1970	23.85738
1971	23.22401
1972	21.85362
1973	22.62018
1974	23.29361
1975	26.40448
1976	27.12714
1977	27.24859
1978	27.52986
1979	28.00689
1980	28.8992
1981	30.43494
1982	33.16825
1983	32.53822
1984	32.7173
1985	33
1986	34.94684
1987	33
1988	33.44033
1989	34.48041
1990	37.17407
1991	37.7
1992	37.95331
1994	39.00011
1995	38.32271
1996	40.00491
1997	40.29397
2000	44.08171
2001	44.0858
2002	45.19499
2003	45.19396
2004	44.99668
2005	44.98053
2006	45.49526
2007	45.79914
2008	45.8677
2009	45.7481
2010	46.56317
2011	46.34267
2012	46.35691
2013	46.64627
2014	46.92607
2015	47.41754
2016	47.47697
2017	47.75085