Year	% female
1971	33.85884
1972	34.8675
1973	37.84809
1974	36.68361
1975	37.51208
1976	37.91516
1977	38.47562
1978	38.94781
1979	39.41266
1980	39.6778
1981	40.08189
1982	42.10362
1983	42.26812
1984	42.45302
1985	42.74931
1986	43.05514
1987	43.37208
1988	43.55862
1989	43.80822
1990	43.4931
1991	43.39292
1992	43.28942
1994	46.21206
1995	46.44251
1996	46.39616
1997	46.48602
1998	36.65871
1999	39.41029
2000	34.9757
2001	37.28969
2002	39.57339
2003	38.57498
2004	38.18909
2005	38.48362
2006	38.48371
2007	38.73534
2008	37.46793
2009	37.5368
2010	38.00354
2011	37.72931
2012	37.99334
2013	41.4514
2014	40.44439
2015	40.00359
2016	37.72586
2017	38.59993