Year	Percent
1999-01-01	11.050
2000-01-01	10.725
2001-01-01	11.000
2002-01-01	11.100
2003-01-01	12.425
2004-01-01	14.800
2005-01-01	18.100
2006-01-01	20.900
2007-01-01	23.250
2008-01-01	26.400
2009-01-01	28.950
2010-01-01	32.250
2011-01-01	34.575
2012-01-01	38.000
2013-01-01	40.450
2014-01-01	42.150
2015-01-01	45.800
2016-01-01	48.200
2017-01-01	53.050