Year	% female
1971	26.44429
1972	28.08752
1973	29.10394
1974	30.2804
1975	30.42455
1976	31.42868
1977	32.19555
1978	32.77351
1979	33.73019
1980	33.6816
1981	33.92716
1982	34.63395
1983	34.98942
1984	36.03599
1985	37.09041
1986	37.44429
1987	38.21486
1988	38.92141
1989	39.94948
1990	40.51068
1991	41.45203
1992	41.21748
1994	40.39302
1995	40.30197
1997	45.45271
1998	42.41514
1999	46.66087
2000	46.66096
2001	46.12915
2003	46.51271
2004	44.70042
2005	44.70273
2006	44.89388
2007	44.00916
2008	45.45569
2009	47.17242
2011	47.8127
2012	47.97949
2013	48.12084
2014	48.16237
2015	48.27931
2016	48.46469