Year	% female
1971	30.37307
1972	31.82787
1973	32.35137
1974	31.77083
1975	31.16572
1976	30.79044
1977	31.20631
1978	31.6378
1979	31.95429
1980	41.07159
1981	43.24453
1982	43.49887
1983	43.31215
1984	43.46757
1985	43.71569
1986	44.20166
1987	44.59597
1988	45.02228
1989	45.62972
1990	45.64619
1991	45.60761
1992	44.828
1999	49.51501
2000	48.47737
2002	50.22333
2003	47.24531
2004	46.4305
2005	46.2107
2006	47.54112
2007	47.19831
2008	47.62071
2009	49.36689
2011	51.79763
2012	52.70124
2013	53.40576
2014	53.78522
2015	53.92947
2016	53.94144
2017	54.26129
2018	54.13324