Year	Percent
1995	91.46159
1996	91.35674
1997	73.23814
1998	74.61619
1999	75.87148
2000	90.45255
2001	91.06995
2002	90.94527
2003	90.80129
2004	90.29386
2005	91.23858
2006	91.11217
2007	91.14521
2008	91.41469
2009	91.11842
2010	90.50637
2011	90.36914
2012	90.59027
2013	90.66762
2014	90.77185
2015	90.92356
2016	90.82684
2017	91.02715