Year	% female
1971	27.92713
1972	28.27444
1973	28.73564
1975	29.87158
1976	30.0529
1977	30.35675
1978	30.67799
1980	31.09421
1981	31.73041
1982	31.55264
1983	33.91154
1984	32.34812
1986	33.30221
1987	33.50925
1988	34.02343
1989	34.58569
1993	36.66118
1994	37.25654
1995	37.23123
1996	37.42465
1997	38.1422
1999	39.33039
2000	39.57881
2001	39.78754
2002	40.6543
2003	42.56015
2004	42.58345
2005	43.01821
2006	43.30394
2007	43.97258
2008	44.57866
2009	45.49483
2010	45.62132
2011	45.98162
2012	46.14815
2013	47.57302
2014	47.64562
2015	47.59985
2016	47.68043
2017	47.4799
2018	48.05586