Year	% female
1973	40.48308
1974	40.70303
1975	40.82848
1976	40.78366
1977	41.4692
1978	42.50766
1979	42.39538
1980	41.99592
1981	41.11479
1982	40.76762
1983	41.2418
1984	41.4291
1985	41.8819
1986	42.0414
1987	42.42314
1988	42.5608
1989	42.85901
1990	43.35024
1991	43.69372
1992	44.30241
1993	44.56693
1994	45.17933
1995	45.57213
1996	45.90538
1997	46.3046
1998	46.70452
1999	47.03549
2000	47.24001
2001	47.31537
2002	47.45441
2003	47.52297
2004	47.66871
2005	47.77875
2006	47.9246
2007	48.04012
2008	48.13179
2009	48.29787
2010	48.44262
2011	48.50052
2012	48.65731
2013	48.67311
2014	48.78218
2015	48.54874
2016	48.7074
2017	48.75261
2018	48.84209