Year	% female
1971	39.27681
1972	39.44726
1973	40.31127
1974	41.4708
1976	44.25741
1977	44.23702
1978	44.82896
1982	44.69421
1983	45.1155
1984	45.21984
1985	45.83804
1986	46.71649
1987	46.91395
1988	47.36854
1989	47.75498
1990	48.35418
1991	49.20626
1992	49.83305
1993	49.90326
1994	49.86648
1995	50.11488
1999	49.55986
2000	51.19282
2001	48.4166
2002	48.09025
2003	48.1451
2004	47.96578
2005	49.12865
2006	49.33055
2007	49.92752
2009	50.33322
2010	51.12081
2014	50.43857
2016	52.13699
2017	52.08331
2018	51.96351