Year	% female
1971	28.49279
1972	29.08362
1978	31.58513
1979	32.18335
1980	32.45399
1981	32.74654
1982	33.68875
1983	33.06985
1984	32.76125
1985	33.03648
1986	32.94281
1988	33.39826
1989	33.02986
1990	33.50593
1992	34.55762
1996	37.46659
1997	37.33822
1998	38.02866
1999	38.95913
2000	39.24511
2001	39.51821
2002	39.92422
2004	41.62121
2005	42.45662
2006	42.81902
2008	43.8819
2010	46.29692
2011	47.52921
2012	48.20204
2013	48.92414
2014	49.61256
2017	51.75372
2018	51.87243