Year	% female
1970	36.00823
1971	35.83546
1972	35.69536
1973	35.82072
1974	35.95439
1975	35.59042
1976	35.38394
1977	35.29874
1978	35.24412
1979	35.17213
1980	35.62916
1981	35.9251
1982	36.89103
1983	37.09044
1984	37.44702
1985	37.88609
1986	38.33874
1987	38.82131
1988	39.05992
1989	39.35993
1990	39.59949
1991	39.88337
1992	40.01112
1993	39.88077
1994	39.23452
1995	40.33538
1996	40.29693
1997	40.25899
1998	40.22809
1999	40.41051
2000	40.48475
2001	40.57743
2002	40.71435
2003	41.12194
2004	40.76617
2005	41.14834
2006	41.20785
2007	41.59239
2008	41.96315
2009	42.3715
2010	42.89926
2011	43.57365
2012	43.96586
2013	44.44357
2014	44.61334
2015	45.04366
2016	45.23154
2017	45.39875
2018	45.57916