Year	% female
1971	30.0133
1972	30.80053
1973	31.21098
1986	37.43517
1987	36.59989
1988	34.2397
1989	30.80364
1994	36.80116
1995	37.57221
1997	36.65887
1998	34.80431
1999	34.12695
2000	34.80111
2001	35.57478
2002	37.02517
2003	38.50933
2004	40.38637
2005	41.97238
2006	43.33139
2007	44.10149
2008	44.88341
2009	45.72204
2010	46.27258
2011	46.987
2012	47.57578
2013	48.30309
2014	48.99796
2015	49.86379
2016	50.71143
2017	51.5394
2018	51.7974