Year	% female
1971	19.97797
1972	21.12238
1973	25.50839
1974	28.72255
1975	30.30821
1976	30.85958
1977	33.05183
1978	32.18051
1979	32.31776
1980	32.54723
1981	31.97286
1982	36.5526
1983	32.67058
1984	32.9817
1985	34.38959
1986	33.89105
1987	35.81838
1988	36.45998
1989	37.40508
1990	38.32801
1991	36.82675
1992	37.82388
1993	38.77013
2003	43.54587
2004	43.03617
2005	42.54222
2006	42.55107
2007	41.91002
2009	42.00397
2010	41.86956
2011	42.4928
2012	43.38291
2013	44.90565
2014	46.747
2015	48.43815
2016	49.9138
2017	51.20159
2018	52.69295