Year	Percent
1999-01-01	2.800
2000-01-01	2.300
2001-01-01	1.700
2002-01-01	2.800
2003-01-01	3.800
2004-01-01	4.000
2005-01-01	3.900
2006-01-01	3.400
2007-01-01	2.900
2008-01-01	2.800
2009-01-01	3.800
2010-01-01	4.525
2011-01-01	4.125
2012-01-01	4.300
2013-01-01	4.625
2014-01-01	4.725
2015-01-01	4.750
2016-01-01	4.875
2017-01-01	4.625