Year	Percent
1999-01-01	59.300
2000-01-01	60.525
2001-01-01	59.950
2002-01-01	59.900
2003-01-01	59.600
2004-01-01	60.350
2005-01-01	61.075
2006-01-01	61.000
2007-01-01	62.025
2008-01-01	62.400
2009-01-01	61.600
2010-01-01	62.025
2011-01-01	61.925
2012-01-01	61.825
2013-01-01	61.800
2014-01-01	61.900
2015-01-01	61.800
2016-01-01	62.300
2017-01-01	63.125