Year	% female
1970	37.87693
1971	37.86133
1972	38.61918
1973	38.48552
1974	38.36486
1975	38.66261
1976	38.92004
1977	39.89006
1978	40.3645
1979	40.55882
1980	40.91042
1981	41.66949
1982	42.36029
1983	41.66008
1984	42.3736
1985	42.13389
1986	42.31738
1987	42.63816
1988	43.10924
1989	43.33287
1990	43.63937
1991	43.99376
1992	44.13088
1993	44.26922
1994	44.42993
1995	44.18021
1996	44.19113
1997	44.39767
1998	44.55361
1999	45.14485
2000	45.40058
2001	45.61463
2002	45.75785
2003	46.01169
2004	45.99428
2005	46.633
2006	46.9957
2007	47.15756
2008	47.34307
2009	47.55358
2010	47.75305
2011	47.63049
2012	47.77257
2013	47.91433
2014	48.0278
2015	48.28444
2016	48.3299
2017	48.31908
2018	48.2923