Year	% female
1970	31.51466
1971	32.50624
1972	34.08054
1973	35.09098
1974	36.04769
1975	37.63676
1976	38.57524
1977	39.73074
1978	40.77503
1979	41.42173
1980	41.60763
1981	42.08248
1982	41.79955
1983	41.96175
1984	43.29997
1985	43.13536
1986	44.18269
1987	44.36246
1988	44.58868
1989	44.96389
1990	45.89401
1991	46.05854
1992	46.56166
1993	47.1916
1994	47.85522
1995	48.47509
1998	48.75464
1999	48.72285
2000	48.62755
2001	48.36744
2002	48.79914
2003	50.51428
2004	48.11744
2005	48.59599
2006	47.96538
2007	46.31011
2008	47.49355
2009	47.21243
2012	47.96194
2014	48.93913
2015	48.47487
2016	49.24409