Year	% female
1971	27.82572
1972	28.19624
1973	28.65567
1975	29.79287
1976	29.97137
1977	30.33541
1978	30.66004
1979	30.87394
1980	31.14583
1981	31.72106
1982	31.59549
1983	33.97972
1984	32.39043
1985	33.18122
1986	33.36076
1987	33.6164
1988	34.11626
1989	34.63455
1990	35.02249
1991	35.6818
1992	35.9975
1993	36.98338
1994	37.58291
1995	37.5129
1996	37.66802
1997	38.39894
1999	39.49164
2000	39.74704
2001	39.95304
2002	40.8445
2003	42.80238
2004	42.80407
2005	43.21012
2006	43.47537
2007	44.12035
2008	44.73951
2013	47.96145
2014	48.02789
2015	48.02727
2016	48.10071
2017	48.03725