Year	Percent
2000-01-01	2.200
2001-01-01	1.550
2002-01-01	2.150
2003-01-01	2.450
2004-01-01	2.900
2005-01-01	3.600
2006-01-01	3.425
2007-01-01	3.200
2008-01-01	2.950
2009-01-01	2.850
2010-01-01	3.700
2011-01-01	4.850
2012-01-01	5.150
2013-01-01	6.200
2014-01-01	7.275
2015-01-01	7.575
2016-01-01	7.400
2017-01-01	5.875