Year	% female
1971	33.04871
1972	34.24465
1973	35.06052
1974	35.53236
1975	36.22431
1976	36.58013
1977	37.30436
1978	38.16969
1981	39.12021
1982	39.72257
1983	40.66877
1984	41.02141
1985	40.84756
1986	40.49007
1987	40.16643
1988	40.45748
1989	40.88686
1990	41.37458
1991	42.46454
1992	42.86649
1993	43.69114
1994	44.42308
1995	45.44471
1999	47.70012
2000	47.95052
2001	48.13004
2002	48.38992
2003	48.34598
2004	49.07047
2005	49.15612
2006	49.42287
2007	50.54032
2008	49.70741
2009	49.43409
2010	49.43875
2011	49.44836
2012	49.30831
2013	50.07322
2014	49.86082
2015	49.78435
2016	49.9835
2017	50.21279