Year	% female
1970	2.54453
1971	10.61453
1972	9.79592
1973	13.15136
1974	15.55977
1976	20.07344
1977	19.33276
1978	19.13043
1979	22.78226
1983	25.79608
1984	24.22395
1985	24.12698
1992	32.48367
1993	34.98258
1994	37.43715
1995	40.39768
1996	41.28073
1997	42.24732
1998	42.85481
1999	43.31613
2000	43.83345
2001	44.60256
2002	45.35876
2003	46.24211
2004	46.73169
2005	47.3527
2006	47.96948
2007	48.34999
2014	51.22216
2015	51.50254
2016	51.90794
2017	52.01331
2018	52.37815