Year	Percent
1999-01-01	2.500
2000-01-01	2.300
2001-01-01	1.600
2002-01-01	1.800
2003-01-01	2.500
2004-01-01	3.400
2005-01-01	3.700
2006-01-01	3.400
2007-01-01	3.800
2008-01-01	2.700
2009-01-01	2.300
2010-01-01	3.475
2011-01-01	3.675
2012-01-01	3.375
2013-01-01	3.125
2014-01-01	3.150
2015-01-01	3.550
2016-01-01	3.125
2017-01-01	3.325