Year	% female
1971	31.00589
1972	31.67232
1973	32.22468
1974	32.95388
1975	33.6562
1976	34.73209
1977	35.75614
1978	36.91806
1979	37.93505
1980	38.54611
1981	39.15207
1982	39.384
1983	39.52804
1984	39.10065
1985	38.58928
1986	38.32126
1987	38.26214
1988	38.59881
1989	38.75249
1990	39.28533
1991	39.51422
1992	39.97453
1994	40.00024
1995	40.49692
1996	40.89102
1997	41.49753
1998	42.18434
1999	43.0758
2000	43.82005
2001	44.2829
2002	44.89378
2003	45.24251
2004	45.62185
2005	45.94279
2006	46.25192
2007	46.39655
2008	46.73139
2009	45.99858
2010	47.36343
2011	47.56901
2012	47.92226
2013	48.23437
2014	48.402
2015	48.6356
2016	48.63565
2017	48.69193
2018	48.95802