Year	% female
1972	33.28153
1973	28.70639
1975	28.3671
1976	28.28878
1977	28.37653
1978	28.0733
1979	29.17351
1980	30.50048
1981	29.29645
1982	30.18952
1983	31.08948
1984	31.53968
1985	32.65254
1986	33.57501
1987	34.35759
1988	35.61864
1989	35.85155
1990	36.54179
1991	37.65778
1993	37.48327
1994	39.51268
1995	40.37876
1996	40.32955
1999	41.22648
2000	42.8145
2001	43.5976
2002	43.60331
2004	44.57286
2005	44.71307
2006	45.48294
2007	45.22712
2008	45.60602
2009	46.37104
2010	47.28104
2011	47.41079
2012	46.96703
2013	47.23515
2014	47.46204
2015	47.7728
2016	47.0801
2017	48.41682
2018	49.53251