Year	Percent
1999-01-01	57.150
2000-01-01	55.300
2001-01-01	55.175
2002-01-01	55.525
2003-01-01	56.400
2004-01-01	56.450
2005-01-01	57.800
2006-01-01	59.875
2007-01-01	61.075
2008-01-01	62.575
2009-01-01	60.350
2010-01-01	58.200
2011-01-01	58.775
2012-01-01	59.100
2013-01-01	58.600
2014-01-01	59.450
2015-01-01	60.875
2016-01-01	62.100
2017-01-01	62.375