Year	% female
1971	27.99291
1972	27.66795
1973	29.40158
1974	30.01526
1975	30.73691
1976	31.57084
1977	29.23511
1979	32.74336
1980	36.16454
1981	33.49432
1982	35.17103
1983	33.64515
1984	34.30184
1985	34.99989
1986	33.58723
1994	35.15908
1999	37.53818
2000	38.95165
2001	39.15485
2003	39.92926
2004	40.32671
2005	40.73328
2006	41.27081
2007	41.55788
2008	41.84794
2009	41.92658
2010	42.49667
2011	42.99433
2012	43.94984
2013	44.98252
2014	45.73683
2015	47.05256
2016	47.80332
2017	48.36088
2018	49.07022