Year	% female
1971	37.94437
1972	38.82777
1973	39.35747
1974	39.85837
1975	40.31653
1976	40.76574
1977	41.29229
1978	41.97992
1979	42.85307
1980	44.45751
1981	45.47416
1982	45.70357
1983	45.90399
1984	46.52554
1985	46.96934
1986	47.30646
1987	47.96972
1988	47.23154
1989	47.35489
1990	47.49043
1991	47.73273
1992	47.89118
1993	48.13969
1994	48.00139
1995	48.52863
1996	48.53747
1997	48.33276
1998	48.15452
1999	47.92297
2000	47.84866
2001	47.72176
2002	47.47885
2003	47.35486
2004	47.23561
2005	47.15203
2006	46.92403
2007	46.8656
2008	46.9005
2009	46.98703
2010	47.12136
2011	47.21266
2012	47.40355
2013	47.57525
2014	47.70265
2015	47.74147
2016	47.72339
2017	47.78214