Year	% female
1970	36.2831
1971	36.38153
1972	36.71446
1973	37.16377
1974	37.19079
1975	37.26342
1976	37.69576
1977	37.77591
1978	38.33623
1979	38.7528
1980	39.32477
1981	40.00244
1982	40.39787
1983	40.70305
1984	41.05537
1985	41.19484
1986	41.38884
1987	41.36574
1988	41.37989
1989	41.49508
1990	41.58721
1991	41.4366
1992	41.68381
1993	41.6654
1994	41.87906
1995	42.2095
1996	42.28243
1997	42.37971
1998	42.84994
1999	42.56529
2000	42.70601
2001	43.21549
2002	42.34247
2003	44.19991
2006	44.08438
2007	44.14096
2008	44.10145
2009	44.7004
2011	45.3226
2012	45.68745
2013	46.13392
2014	46.36633
2015	46.71188
2016	47.1361
2017	47.53503
2018	47.90466