Year	Percent
1999-01-01	2.800
2000-01-01	2.400
2001-01-01	1.800
2002-01-01	2.900
2003-01-01	3.900
2004-01-01	4.000
2005-01-01	4.000
2006-01-01	3.500
2007-01-01	3.000
2008-01-01	2.900
2009-01-01	3.900
2010-01-01	4.600
2011-01-01	4.225
2012-01-01	4.400
2013-01-01	4.725
2014-01-01	4.850
2015-01-01	4.850
2016-01-01	5.050
2017-01-01	4.750