Year	% female
1971	21.7551
1972	15.00536
1973	6.42518
1974	8.82051
1975	10.75621
1976	16.66287
1977	19.06741
1978	21.37821
1979	17.88396
1980	21.93172
1981	21.72648
1982	21.45793
1983	19.44603
1984	18.27382
1985	19.98371
1986	20.99717
1987	29.10741
1988	29.24981
1989	27.19477
1990	25.28066
1991	21.79468
1992	18.59473
1993	15.85484
1994	14.9668
1995	14.09237
1996	14.41675
1997	8.74965
1998	8.43628
1999	9.47794
2000	19.20639
2001	20.17699
2002	27.61146
2003	28.22407
2004	27.73919
2005	31.40643
2006	34.0635
2007	35.72241
2008	34.92647
2010	33.60788
2011	38.59797
2012	38.01418
2013	41.49688
2014	41.01101
2015	40.12567
2016	41.46341
2017	41.35716