Year	% female
1970	37.35512
1971	37.62155
1972	37.68051
1973	37.42227
1974	37.37316
1975	36.84318
1976	36.81093
1977	36.62819
1978	36.43322
1979	36.42279
1980	36.80913
1981	37.56139
1982	38.28569
1983	38.47159
1984	38.6304
1985	38.68165
1986	38.84878
1987	38.90904
1988	39.0785
1989	39.1759
1990	39.26209
1991	39.24892
1992	39.35174
1993	39.28539
1994	38.67288
1995	39.8335
1996	39.83677
1997	39.75359
1998	39.68021
1999	39.70118
2000	39.82636
2001	39.79616
2002	40.04312
2003	40.63781
2004	40.50124
2005	41.00632
2006	41.12976
2007	41.61843
2008	42.08466
2009	42.44703
2010	43.12461
2011	43.7234
2012	44.17246
2013	44.4577
2014	44.59565
2015	44.88739
2016	45.05869
2017	45.19367
2018	45.30684