Year	% female
1970	44.75123
1971	45.71646
1972	46.31414
1973	47.08254
1974	47.23438
1975	47.52977
1976	48.35695
1977	48.816
1978	49.28702
1979	49.74247
1980	49.9742
1981	50.51766
1982	50.57649
1983	51.12839
1984	51.22588
1991	50.34048
1992	51.08809
1993	50.97838
1994	50.62216
1998	50.93837
1999	50.75234
2000	49.90769
2001	49.59985
2002	49.23757
2003	49.28789
2004	49.0336
2005	48.8246
2006	48.87877
2007	48.82507
2008	48.62683
2009	48.52137
2010	48.58181
2011	48.1549
2012	48.47507
2013	48.63157
2014	48.12994
2015	48.346
2016	48.6828
2017	48.92047
2018	48.99839