Year	Percent
2000-01-01	19.825
2001-01-01	19.975
2002-01-01	20.150
2003-01-01	21.300
2004-01-01	21.550
2005-01-01	21.675
2006-01-01	21.975
2007-01-01	21.225
2008-01-01	19.950
2009-01-01	21.125
2010-01-01	21.875
2011-01-01	22.175
2012-01-01	21.725
2013-01-01	21.825
2014-01-01	22.000
2015-01-01	21.775
2016-01-01	21.950
2017-01-01	22.675