Year	Percent
1990	43.64896
1991	33.33333
1992	57.6087
1993	83.35025
1994	84.10611
1995	54.05303
1996	50.4251
1997	65.6563
1998	63.90657
1999	61.63178
2000	72.39834
2001	70.29732
2002	67.37454
2003	68.98547
2004	74.25018
2005	59.08654
2006	64.23379
2007	67.21083
2008	68.66172
2009	61.78059
2010	64.54509
2011	79.50889
2012	74.30836
2013	61.48239
2014	55.71042
2015	57.90406
2016	62.69998
2017	66.95064