Year	% female
1970	32.90707
1971	32.99129
1972	33.48487
1973	34.23738
1974	33.75707
1975	34.31395
1976	34.17803
1977	33.84195
1978	33.98854
1979	34.41909
1980	34.77984
1981	35.26734
1982	35.5115
1983	36.0611
1984	36.16218
1985	36.77967
1986	37.37269
1988	37.27634
1994	38.36077
1998	42.80431
1999	43.39948
2000	44.51522
2001	43.44988
2002	45.19494
2004	44.10376
2005	44.61734
2007	46.88916
2008	45.36963
2009	48.25951
2010	45.34953
2011	46.81781
2012	46.30717
2013	46.82706
2014	47.40592
2015	47.36851
2016	47.65228
2017	48.47013