Year	% female
1971	21.80531
1972	24.26702
1973	23.68214
1974	24.84858
1976	25.76834
1978	27.14789
1979	27.6426
1980	27.82853
1981	28.74587
1982	27.9244
1983	27.59286
1984	28.39739
1987	29.85196
1988	28.95937
1989	32.62335
1990	32.87277
1991	33.4873
1992	30.91749
1993	33.05864
1994	32.5708
1995	32.50821
1996	33.55174
1997	32.60666
1998	33.20415
1999	34.18282
2000	35.19177
2003	34.63753
2004	36.65484
2005	37.47824
2006	37.45621
2007	39.06947
2008	38.64026
2009	39.03197
2010	40.17184
2011	40.56993
2013	43.33405
2014	41.99081
2015	43.61438
2016	42.03535
2017	44.06245
2018	44.48754