Year	Percent
1996	97.34513
1997	38.08474
1998	48.88311
1999	50.81965
2000	32.06448
2001	27.85837
2002	22.74825
2003	27.62033
2004	31.30297
2005	38.6127
2006	55.52029
2007	68.86234
2008	29.86915
2009	51.2963
2010	78.82153
2011	73.64333
2012	91.69288
2013	79.94532
2014	92.00805
2015	81.5714
2016	78.63123
2017	92.60391