Year	% female
1981	20.48683
1987	28.70549
1988	29.50103
1989	29.95862
1990	30.61219
1991	31.75577
1992	33.50996
1993	33.30855
1994	35.37219
1995	35.94923
1996	33.52651
1997	34.51685
1998	41.20169
1999	41.11261
2000	41.66082
2001	42.85267
2002	43.12333
2003	44.43352
2004	45.30733
2005	45.89745
2006	44.96089
2008	46.06483
2009	44.8113
2010	45.24164
2011	45.06072
2012	45.08912
2013	47.64196
2014	47.05534
2015	47.46215
2016	48.55742
2017	49.39017
2018	49.71302