Year	% female
1971	3.97906
1972	10.25465
1973	17.18346
1974	24.3007
1975	24.36888
1976	27.67372
1977	28.23864
1978	31.45822
1979	32.95053
1980	29.93164
1981	35.16014
1982	38.39527
1983	39.6475
1984	39.11136
1985	36.58473
1986	34.99365
1987	32.80156
1988	31.09405
1989	29.5316
1990	27.24579
1991	25.9515
1992	25.69343
1993	24.87095
1994	25.50177
1995	24.8559
1996	27.54443
1997	31.15137
1998	32.65411
1999	35.23322
2000	37.85862
2001	40.29143
2002	40.54136
2003	40.54145
2004	38.57059
2005	38.65803
2006	39.23026
2008	35.6652
2009	26.62168
2010	12.60399
2011	11.68535
2012	13.70084
2013	14.04591
2014	11.54822
2015	10.24602
2016	8.40666
2017	8.25945
2018	8.13083