Year	% female
1971	28.27188
1972	29.35512
1974	32.13989
1975	32.4525
1976	34.32153
1977	35.095
1978	36.17985
1979	37.0194
1980	37.48402
1981	37.71939
1982	38.46573
1983	39.21485
1984	39.58873
1985	39.47902
1986	39.04262
1987	39.19387
1988	38.94139
1989	38.96161
1990	40.82167
1991	41.24778
1992	41.01035
1993	41.36654
1994	41.48955
1995	41.88266
1996	41.96858
1997	42.35133
1998	42.87252
1999	43.35927
2000	43.67043
2001	43.82648
2002	44.04025
2003	44.51699
2004	44.82696
2005	45.23656
2006	45.55294
2007	45.71359
2008	45.59052
2009	45.51286
2010	45.58686
2011	45.28152
2012	44.97206
2017	45.99789
2018	46.56576