Year	Percent
1999-01-01	10.325
2000-01-01	9.825
2001-01-01	9.775
2002-01-01	9.525
2003-01-01	11.250
2004-01-01	12.600
2005-01-01	15.575
2006-01-01	18.925
2007-01-01	21.175
2008-01-01	24.175
2009-01-01	26.100
2010-01-01	28.700
2011-01-01	31.425
2012-01-01	33.625
2013-01-01	35.725
2014-01-01	37.225
2015-01-01	40.975
2016-01-01	43.500
2017-01-01	49.600