Year	% female
1970	37.34908
1971	37.18441
1972	37.74083
1973	37.91722
1974	38.27155
1975	38.5071
1976	38.86031
1977	39.41194
1978	40.01974
1979	40.22628
1980	40.67024
1981	40.7856
1982	41.68881
1983	41.77759
1984	42.02362
1985	41.67196
1986	41.91119
1987	42.48367
1988	42.13361
1989	42.3856
1990	42.52055
1991	42.87296
1992	42.915
1993	43.01653
1994	43.15364
1995	42.74227
1996	42.59243
1997	42.88258
1998	43.00808
1999	43.73529
2000	44.06218
2001	44.36155
2002	44.58345
2003	44.87498
2004	44.80392
2005	45.65104
2006	46.14977
2007	46.38179
2008	46.67939
2009	47.01192
2010	47.22963
2011	47.3782
2012	47.47297
2013	47.58623
2014	47.60969
2015	47.8523
2016	47.90368
2017	47.89668
2018	47.87914