Year	Percent
1999-01-01	98.0913
2000-01-01	98.1973
2001-01-01	98.3547
2002-01-01	98.4307
2003-01-01	99.2253
2004-01-01	99.9952
2005-01-01	99.9948
2006-01-01	99.9929
2007-01-01	99.9919
2008-01-01	99.9921
2009-01-01	99.9898
2010-01-01	99.9883
2011-01-01	97.9263
2012-01-01	97.9487
2013-01-01	99.9875
2014-01-01	99.9851
2015-01-01	99.9841
2016-01-01	99.9851