Year	Percent
1997-01-01	100.0000
1998-01-01	100.0000
1999-01-01	88.8600
2000-01-01	100.0000
2001-01-01	100.0000
2002-01-01	100.0000
2003-01-01	100.0000
2004-01-01	99.9194
2005-01-01	82.6755
2006-01-01	78.2818
2007-01-01	73.9401
2008-01-01	66.2232
2009-01-01	65.4414
2010-01-01	65.1930
2011-01-01	58.9672
2012-01-01	58.1159
2013-01-01	62.2148
2014-01-01	63.7302
2015-01-01	66.2901
2016-01-01	70.1020