Year	% female
1970	31.07568
1971	30.93496
1972	30.96857
1973	31.04237
1974	31.23598
1975	31.27319
1976	31.55728
1977	30.34154
1978	30.13107
1979	30.15156
1980	31.2884
1981	30.75238
1982	32.1221
1983	33.15311
1984	34.31246
1985	34.24563
1986	35.45413
1987	35.5627
1988	36.13474
1989	36.67008
1990	36.77103
1991	37.50851
1992	38.26392
1993	38.85899
1994	39.33938
1995	40.91327
1996	41.61189
1997	42.44059
1998	43.10255
1999	43.66933
2000	44.2454
2001	44.38785
2002	44.71894
2003	44.65763
2004	43.63506
2005	44.20438
2006	44.15367
2007	44.39679
2008	45.01621
2009	45.01762
2010	45.88086
2011	46.40395
2012	46.61719
2013	46.63842
2014	46.89618
2015	47.39278
2016	47.45715
2017	47.90451
2018	47.99085