Year	% female
1970	32.86261
1971	32.87234
1972	33.5062
1973	34.09539
1974	34.76244
1975	34.93949
1976	35.58929
1977	36.18
1978	36.63142
1979	37.11627
1980	37.4648
1981	38.13932
1982	38.70131
1983	39.27637
1984	39.71482
1985	40.14085
1986	40.45316
1987	40.75237
1988	41.12628
1989	41.5482
1990	42.11966
1991	42.80317
1992	43.41357
1993	43.86269
1994	44.06466
1995	44.87071
1996	45.29779
1997	45.92597
1998	46.34539
1999	46.80706
2000	47.07739
2001	47.22858
2002	47.45172
2003	47.62548
2004	47.95178
2005	48.14672
2006	48.32144
2007	48.64556
2008	48.51253
2009	48.40957
2010	48.38459
2011	48.39591
2012	48.4022
2013	48.42576
2014	48.27191
2015	48.27007
2016	48.3483
2017	48.39878
2018	48.4855