Year	% female
1971	41.44178
1972	41.29191
1973	42.49904
1974	43.64589
1975	44.33677
1976	45.25275
1977	46.25255
1978	47.28641
1979	47.23971
1980	48.33874
1981	47.62743
1982	47.30711
1983	47.02716
1984	46.38011
1985	47.18336
1986	47.27862
1987	47.66414
1988	49.09592
1989	49.21296
1990	49.67499
1996	50.35754
1998	49.6311
1999	48.9238
2000	48.51658
2001	48.7612
2002	49.40053
2003	49.20666
2004	48.98087
2005	48.85273
2006	50.21524
2007	50.2104
2008	50.33306
2009	50.50746
2010	50.55432
2011	50.51472
2012	50.50699
2013	49.99187
2014	49.69812
2015	50.262
2016	50.26755
2017	50.79189
2018	50.41822