Year	% female
1971	19.68248
1972	20.44944
1973	22.07018
1974	22.38786
1975	23.31451
1976	23.26165
1977	23.88088
1978	24.15869
1979	26.12282
1980	25.61019
1981	25.93866
1982	26.03948
1983	25.12693
1984	25.19925
1985	25.6005
1986	27.14555
1987	27.40481
1988	27.90805
1989	28.13482
1990	28.17438
1991	31.1633
1992	32.19136
1996	35.20559
2002	44.77795
2006	42.4601
2007	42.06713
2008	42.04456
2009	42.86363
2010	42.05559
2011	41.3023
2012	40.58724
2013	40.38621
2014	42.24149
2015	42.537
2016	43.02913
2017	43.09371
2018	44.37783