Year	% female
1970	38.16109
1971	38.40277
1972	38.86127
1973	39.24492
1974	39.78721
1975	40.15298
1976	40.36445
1977	41.25657
1978	41.94462
1979	42.53903
1980	43.02914
1981	43.39535
1982	43.95202
1983	43.79212
1984	43.85528
1985	43.82946
1986	44.00055
1987	44.41773
1988	43.74519
1989	44.41385
1990	44.00584
1991	44.26864
1992	44.28584
1993	44.23177
1994	44.47103
1995	44.3273
1996	44.4686
1997	44.53691
1998	44.47168
1999	44.73198
2000	44.92129
2001	45.10263
2002	45.01807
2003	45.29819
2004	45.13665
2005	45.64385
2006	45.97311
2007	46.23046
2008	46.44843
2009	46.69014
2010	46.90547
2011	46.91684
2012	47.30606
2013	47.50763
2014	47.68058
2015	47.90974
2016	47.83241
2017	47.87592
2018	47.86925