Year	% female
1973	20.61856
1974	18.85442
1975	21.16183
1976	16.4612
1977	19.50368
1978	18.09811
1979	20.0375
1980	22.43279
1981	24.18932
1982	26.92924
1983	26.65745
1984	28.65273
1985	30.85618
1986	33.0705
1987	35.15099
1988	37.36355
1989	39.69866
1990	41.3199
1991	43.8991
1992	45.44547
1993	46.39411
1994	46.85612
1995	47.35954
1996	47.76711
1997	48.28575
1998	48.58087
1999	49.14357
2000	49.09682
2001	48.91747
2002	48.62301
2003	48.09704
2005	47.68576
2006	47.77218
2007	47.7908
2008	48.02999
2009	48.00292
2011	48.64468
2012	48.52416
2013	48.96863
2015	48.82363
2016	48.20415
2017	48.76796
2018	48.60193