Year	Percent
1999-01-01	3.300
2000-01-01	3.100
2001-01-01	3.400
2002-01-01	3.200
2003-01-01	4.000
2004-01-01	4.600
2005-01-01	4.600
2006-01-01	4.500
2007-01-01	4.200
2008-01-01	3.600
2009-01-01	4.100
2010-01-01	4.925
2011-01-01	4.475
2012-01-01	4.475
2013-01-01	4.650
2014-01-01	4.825
2015-01-01	4.625
2016-01-01	4.925
2017-01-01	5.075