Year	% female
1972	38.32666
1973	38.79567
1974	39.84686
1975	40.20143
1976	40.85133
1977	41.60253
1978	42.10144
1979	42.28957
1980	42.5587
1981	43.20089
1982	43.70014
1983	44.19937
1984	44.43853
1985	44.46479
1986	45.12973
1987	45.64134
1988	46.00728
1989	45.98735
1990	46.01338
1991	46.27682
1992	46.4158
1993	48.42416
1994	48.94049
1995	47.68193
1996	47.72619
1999	48.73107
2000	48.86358
2001	48.90194
2002	48.90499
2004	50.28206
2005	50.23692
2006	50.47241
2007	50.43676
2008	50.22121
2009	50.25065
2010	50.44136
2011	50.51477
2012	50.43786
2013	50.32932
2014	50.31492
2015	50.32556
2016	50.44968
2017	50.53808
2018	49.94967