Year	% female
1971	44.87858
1972	50.97856
1973	58.24497
1974	54.89645
1990	52.49595
1992	52.08136
1993	52.59775
1999	51.35441
2000	50.47643
2001	50.21442
2002	50.16065
2003	50.22847
2004	49.62265
2005	49.42736
2006	49.3221
2007	49.22044
2008	49.23554
2009	49.31347
2010	48.68662
2011	48.28874
2012	48.27856
2013	48.07052
2014	47.85986
2015	48.03244
2016	48.24839
2017	48.41117
2018	48.2975