Year	% female
1971	47.56921
1972	47.80778
1973	48.19277
1974	48.74586
1975	49.23448
1976	49.59792
1977	49.98622
1978	50.27709
1979	50.85182
1980	51.38017
1981	51.98937
1982	52.47577
1983	52.69821
1984	52.80267
1985	52.87553
1986	52.88971
1987	52.76879
1988	52.62093
1989	52.48162
1990	52.28177
1991	52.13205
1992	52.17075
1993	52.28052
1994	52.63014
1995	51.9578
1996	51.73527
1997	50.61534
1998	49.55479
1999	49.41315
2000	49.36635
2001	49.35635
2002	49.38607
2003	49.36601
2004	50.61114
2005	50.53518
2006	50.48933
2007	50.50082
2008	50.5372
2009	50.5305
2010	50.53774
2011	50.43238
2012	50.39213
2015	49.03021
2016	49.03164
2017	48.98434