Year	% female
1971	37.34966
1972	37.4606
1973	37.78652
1974	37.83135
1975	37.91359
1976	38.09165
1977	38.18497
1978	37.79893
1979	38.26586
1980	38.39865
1981	38.62989
1982	38.62345
1983	38.90856
1984	39.02512
1985	39.54761
1986	40.24878
1987	40.68219
1988	40.84877
1989	40.31467
1990	40.6775
1991	41.38852
1992	41.70143
1993	42.62675
1994	42.87985
1995	42.9064
1996	43.17114
1997	43.38398
1998	43.4925
1999	43.49726
2000	43.57728
2001	43.76866
2002	44.19226
2003	46.82275
2007	46.9309
2008	47.59237
2009	47.88722
2010	47.78125
2011	47.96006
2012	48.06707
2013	49.94894
2014	49.92135
2015	50.05158
2016	51.11492
2017	50.88245