Year	Percent
1998-01-01	77.0844
1999-01-01	70.7442
2000-01-01	76.8000
2001-01-01	76.5500
2002-01-01	76.0013
2003-01-01	78.4421
2004-01-01	78.4434
2005-01-01	69.8747
2006-01-01	62.5394
2007-01-01	57.0432
2008-01-01	58.4978
2009-01-01	66.2643
2010-01-01	66.1507
2011-01-01	70.3203
2012-01-01	70.7502
2013-01-01	81.8038
2014-01-01	83.5941
2015-01-01	83.7523
2016-01-01	84.3708