Year	% female
1971	37.76821
1972	37.75712
1973	37.7612
1974	37.91633
1975	37.97586
1976	38.305
1977	38.62558
1978	39.02333
1979	39.4309
1980	39.75165
1981	40.2321
1982	40.68429
1983	41.26416
1984	41.98478
1985	42.64354
1986	43.20029
1987	43.65378
1988	42.77022
1989	44.18131
1990	44.61102
1991	44.35141
1992	44.98439
1993	45.19884
1994	44.79675
1995	45.73728
1996	41.99095
1997	45.44422
1999	46.68987
2000	46.9071
2001	47.15847
2002	47.37107
2003	47.60759
2004	47.87272
2005	47.336
2006	47.40855
2007	47.59621
2009	47.7916
2010	47.85334
2011	47.40263
2012	48.1877
2013	48.28475
2014	48.42062
2016	48.51585
2017	48.57092
2018	48.59901