Year	% female
1970	27.84205
1971	27.86786
1972	28.27678
1973	28.68835
1974	29.11654
1975	29.56035
1976	29.7055
1977	29.81991
1978	30.06825
1979	30.40657
1980	30.8062
1981	31.09355
1982	31.24439
1983	33.36771
1984	32.25255
1985	32.62576
1986	33.35121
1987	33.64599
1988	34.14777
1989	34.63448
1990	35.166
1991	35.89179
1992	36.51957
1993	37.1659
1994	37.82283
1995	38.02292
1996	38.38192
1997	39.20503
1998	39.96244
1999	40.65367
2000	40.97766
2001	41.33057
2002	42.14361
2003	43.72217
2004	43.44216
2005	43.90424
2006	44.09067
2007	44.55991
2008	45.14077
2009	45.90578
2010	46.10079
2011	46.43836
2012	46.55626
2013	47.6243
2014	47.87561
2015	47.94301
2016	48.02047
2017	48.08802
2018	48.17813