Year	% female
1970	48.77608
1986	51.85657
1987	52.18552
1988	52.4279
1989	53.52513
1990	54.00811
1991	54.26803
1992	53.29861
1993	53.30124
1994	53.69444
1995	54.39602
1998	53.40986
1999	53.23251
2000	52.93137
2001	52.7461
2002	52.38546
2003	52.19285
2004	52.26732
2005	51.9877
2006	51.86414
2007	51.5995
2008	51.38396
2009	51.5509
2010	51.43662
2011	51.32022
2012	51.45959
2014	52.30053
2015	49.36208
2016	52.08643
2017	51.94324