Year	Percent
1999-01-01	3.600
2000-01-01	3.200
2001-01-01	3.500
2002-01-01	3.200
2003-01-01	4.600
2004-01-01	4.900
2005-01-01	5.200
2006-01-01	4.800
2007-01-01	4.600
2008-01-01	4.000
2009-01-01	4.600
2010-01-01	5.275
2011-01-01	4.900
2012-01-01	4.825
2013-01-01	5.000
2014-01-01	5.150
2015-01-01	5.000
2016-01-01	5.150
2017-01-01	5.200