Year	% female
1971	28.63682
1972	29.75345
1973	30.61518
1974	31.79992
1975	31.63895
1976	32.55153
1977	33.70551
1978	34.32762
1979	34.92015
1980	35.34483
1981	35.33684
1982	35.996
1983	36.20551
1984	37.05933
1985	37.92944
1986	38.48249
1987	39.15118
1988	39.60395
1989	40.15887
1990	40.50302
1991	41.47464
1992	41.6156
1995	40.48358
1997	44.30199
1998	41.85984
1999	45.37704
2001	44.53114
2002	37.86753
2003	45.29468
2004	43.82554
2005	43.83865
2006	43.91834
2007	43.40359
2008	44.14968
2009	45.19826
2011	45.51453
2012	45.82037
2013	45.81926
2014	45.68476
2015	45.81841
2016	45.89873