Year	% female
1970	33.38487
1971	33.36077
1972	33.47132
1973	33.57964
1974	33.82032
1975	33.86482
1976	34.08475
1977	33.25272
1978	33.10265
1979	33.07637
1980	33.9412
1981	33.62461
1982	34.62357
1983	35.28473
1984	36.15752
1985	36.26435
1986	37.20307
1987	37.35595
1988	37.72407
1989	38.07787
1990	38.24077
1991	38.7803
1992	39.33752
1993	39.75635
1994	39.97347
1995	41.17327
1996	41.74648
1997	42.38863
1998	43.02586
1999	43.5521
2000	44.07533
2001	44.20114
2002	44.50026
2003	44.5744
2004	43.79058
2005	44.27256
2006	44.2779
2007	44.54154
2008	45.06221
2009	45.07478
2010	45.68972
2011	46.18889
2012	46.40494
2013	46.44595
2014	46.66929
2015	47.1265
2016	47.2376
2017	47.63947
2018	47.70363