Year	% female
1971	21.42006
1972	22.66465
1973	22.59634
1974	23.13344
1975	24.14927
1976	24.61934
1977	25.08717
1978	26.11233
1979	26.4735
1980	27.87439
1981	28.16792
1982	28.79275
1983	28.16127
1984	28.49716
1985	29.04674
1986	29.33354
1987	30.03696
1988	30.4777
1989	31.05802
1990	31.24069
1991	31.8066
1992	32.47001
1993	32.78883
1994	33.79401
1995	32.41953
1996	33.07081
1997	33.62496
1998	33.99351
1999	34.23911
2000	34.71506
2001	35.12167
2002	35.11594
2006	37.28818
2007	36.69743
2008	36.80643
2009	38.14315
2011	39.20657
2012	39.51163
2013	39.87531
2014	40.48334
2015	40.78747
2016	41.44249
2017	42.29942
2018	43.18875