Year	% female
1971	36.98729
1972	39.68252
1973	40.79842
1977	41.65792
1978	45.64608
1979	44.2286
1980	45.18309
1981	45.33718
1982	45.49991
1984	42.16218
1985	43.26985
1986	44.86316
1988	43.94258
1990	43.4611
1991	43.39326
1992	43.60614
1993	43.50358
1994	43.44007
1995	43.91813
1996	44.00126
1997	44.2679
1998	44.54528
1999	45.10876
2000	45.18395
2001	45.37147
2002	45.47773
2003	45.64949
2004	45.91846
2005	45.97927
2006	46.10604
2007	46.36115
2008	46.6239
2009	46.92732
2010	47.18211
2011	47.44352
2012	47.61386
2013	47.73302
2014	47.83906
2015	48.00321
2016	48.0115
2017	48.14191
2018	48.11446