Year	% female
1970	29.72285
1971	29.76988
1972	30.54194
1973	30.56678
1974	30.50484
1975	31.16774
1976	31.95732
1977	33.07136
1978	33.23477
1979	34.30426
1980	35.29654
1981	35.0888
1982	35.63234
1983	36.15403
1984	36.52196
1985	37.22592
1986	37.17928
1987	37.29049
1988	37.13381
1989	37.1479
1990	38.36127
1991	38.58868
1992	38.93643
1993	40.15687
1994	41.37603
1995	41.3472
1996	41.57086
1997	41.39119
1998	42.31639
1999	42.96801
2000	43.24018
2001	43.25899
2002	42.89255
2003	43.17768
2004	42.34703
2005	42.4738
2006	42.19182
2007	41.70833
2008	40.49534
2009	40.14924
2010	39.90409
2011	39.84003
2012	38.97063
2013	38.54631
2014	38.83989
2015	38.59207
2016	38.57665
2017	38.07918
2018	38.17625