Year	% female
1971	40.98127
1972	41.17723
1973	41.59435
1974	41.77735
1975	42.41854
1976	43.33431
1977	44.24734
1978	45.08033
1981	45.75536
1990	50.70969
1991	49.19851
1992	49.34239
1993	49.50601
2001	48.69364
2002	50.67036
2004	51.8443
2005	51.64634
2006	51.86961
2007	52.32458
2008	52.28279
2009	52.47807
2010	52.20017
2011	52.29191
2012	52.35215
2013	52.8928
2014	51.08847
2015	48.93278
2016	49.59365
2017	48.77552
2018	49.24744