Year	% female
1971	50.45718
1972	50.77245
1973	52.2765
1974	51.74184
1975	51.98529
1976	52.58855
1977	53.04483
1978	53.28028
1979	53.9217
1981	54.61521
1982	54.63345
1983	55.12229
1984	54.49929
1985	54.4495
1986	54.27044
1987	54.38142
1988	54.30167
1989	54.43846
1991	54.46696
1992	54.49184
1993	54.62214
1996	54.65471
1997	54.69365
1999	54.23704
2000	53.71139
2001	53.13941
2002	52.8341
2003	52.57112
2004	52.3279
2005	52.14317
2006	52.0188
2007	51.86495
2008	51.55063
2009	51.32063
2010	51.39336
2011	51.2951
2012	51.14405
2013	51.06752
2014	50.86469
2015	50.91292
2016	50.9412
2017	51.02639