Year	% female
1971	34.09417
1972	36.22642
1973	37.15095
1974	38.43387
1975	39.81692
1976	40.71967
1977	41.50619
1978	42.10411
1979	43.22812
1980	44.33545
1981	44.6833
1982	45.81354
1983	46.10104
1984	46.48621
1985	46.77526
1986	47.61237
1987	47.64547
1988	48.15302
1989	47.9086
1990	47.79626
1991	48.02774
1992	49.41114
1993	49.85582
1994	49.79756
1996	49.37464
1999	49.43075
2000	49.47535
2002	49.37975
2003	49.34988
2004	49.15507
2005	49.24131
2006	49.4566
2007	49.53059
2008	49.62761
2010	50.02888
2011	50.08952
2012	49.96562
2013	49.9171
2014	50.28967
2017	50.30693
2018	50.35248