Year	% female
1971	12.72809
1972	13.16461
1973	5.83611
1974	7.14897
1975	6.61114
1976	6.31545
1977	7.05811
1978	10.48639
1979	11.03181
1980	11.26712
1981	14.17743
1982	15.62331
1983	17.49593
1984	8.08163
1985	10.37075
1986	12.05472
1987	12.18648
1988	13.46927
1989	14.69523
1990	15.70248
1991	17.22772
1992	17.33922
1993	18.05003
1994	18.5224
1995	19.4786
1996	20.34014
1997	20.48114
1999	15.98216
2000	15.71038
2001	16.25528
2002	17.03963
2003	17.51089
2004	17.70414
2005	17.47911
2006	16.8448
2007	15.43768
2008	15.07897
2009	16.00097
2010	16.47781
2011	16.63475
2012	16.93452
2013	18.55505
2014	20.42132
2015	21.8143
2016	23.08793
2017	23.34994