Year	% female
1970	36.43437
1971	36.39786
1972	36.72762
1973	37.08646
1974	37.33249
1975	37.81934
1976	38.30175
1977	38.83509
1978	39.32209
1979	40.28535
1980	40.78429
1981	41.25684
1982	41.58214
1983	41.91628
1984	42.37491
1985	42.80392
1986	43.22498
1987	43.53431
1988	43.6245
1989	44.10159
1990	44.43356
1991	44.57365
1992	44.94037
1993	45.11648
1994	45.14718
1995	45.36993
1996	44.55539
1997	45.34553
1998	45.51364
1999	45.72533
2000	45.93327
2001	46.16149
2002	46.35449
2003	46.48239
2004	46.56479
2005	46.57732
2006	46.64477
2007	46.79706
2008	46.9173
2009	46.97967
2010	47.03119
2011	46.90403
2012	47.19927
2013	47.47481
2014	47.68097
2015	47.75287
2016	47.83428
2017	47.79665
2018	47.82625