Year	% female
1971	28.7124
1972	29.61988
1973	31.74546
1974	32.89843
1975	33.22495
1976	33.97369
1977	34.57174
1978	35.90504
1979	37.17327
1980	38.15994
1981	38.80794
1982	39.73961
1983	40.12699
1984	40.92549
1985	41.35634
1986	41.98329
1987	41.96792
1988	42.33284
1989	43.03015
1990	43.57856
1991	44.28959
1992	44.52265
1993	45.55011
1994	45.91279
1995	46.65855
1996	47.14976
1997	48.53905
1999	50.02862
2000	51.11124
2001	51.19505
2002	51.22828
2003	51.68886
2004	52.19146
2005	52.39302
2006	52.71063
2007	52.45119
2008	52.02418
2009	50.88525
2010	51.38993
2011	51.3852
2012	51.12188
2013	51.14138
2014	51.51222
2015	51.31973
2016	50.79025
2017	50.80259
2018	50.72398