Year	% female
1970	31.25275
1971	31.25993
1972	32.11459
1973	32.74435
1974	33.34281
1975	33.64374
1976	34.40236
1977	35.11293
1978	35.62758
1979	36.22002
1980	36.63666
1981	37.25808
1982	37.82972
1983	38.41648
1984	38.85687
1985	39.31704
1986	39.58548
1987	39.85687
1988	40.1727
1989	40.5508
1990	41.29657
1991	41.96071
1992	42.59063
1993	43.09171
1994	43.41201
1995	44.18435
1996	44.6056
1997	45.1634
1998	45.64869
1999	46.13325
2000	46.41197
2001	46.52342
2002	46.67
2003	46.8608
2004	47.01169
2005	47.21754
2006	47.4234
2007	47.8056
2008	47.56446
2009	47.49763
2010	47.49114
2011	47.51951
2012	47.44527
2013	47.39571
2014	47.49039
2015	47.46732
2016	47.52989
2017	47.53524
2018	47.61761