Year	Percent
1990	45.95843
1991	33.33333
1992	59.78261
1993	67.61421
1994	71.2696
1995	49.66516
1996	46.3498
1997	59.85988
1998	59.05113
1999	59.20334
2000	69.21082
2001	66.74761
2002	63.62752
2003	65.15638
2004	67.88633
2005	59.79781
2006	60.06131
2007	60.94305
2008	60.93776
2009	50.52975
2010	51.37289
2011	78.46536
2012	78.77691
2013	58.33358
2014	54.941
2015	58.01077
2016	62.50935
2017	66.60168