Year	Percent
1999-01-01	45.400
2000-01-01	45.775
2001-01-01	45.425
2002-01-01	45.775
2003-01-01	46.900
2004-01-01	46.975
2005-01-01	47.775
2006-01-01	48.225
2007-01-01	47.775
2008-01-01	47.550
2009-01-01	47.700
2010-01-01	48.825
2011-01-01	49.100
2012-01-01	50.250
2013-01-01	50.500
2014-01-01	52.125
2015-01-01	53.200
2016-01-01	54.075
2017-01-01	54.575