Year	% female
1971	26.11646
1972	25.67422
1973	27.13776
1974	26.92967
1975	26.97522
1976	27.78797
1977	28.538
1978	28.77195
1979	27.67072
1980	28.7398
1981	29.48507
1986	27.98554
1988	29.36383
1989	29.77485
1990	29.4918
1991	29.43891
1992	30.38535
1993	32.75267
1995	33.78523
1996	34.554
1997	35.60766
1998	36.75613
1999	37.85405
2000	38.66105
2001	38.66366
2002	38.56099
2003	38.96555
2004	38.43095
2005	39.07407
2006	38.50284
2007	38.15689
2008	37.97242
2009	37.90552
2010	40.03052
2011	38.72281
2012	39.18898
2013	39.45764
2014	39.81088
2015	40.198
2016	41.0958
2017	41.35818
2018	42.54018