Year	Percent
1999-01-01	2.500
2000-01-01	2.700
2001-01-01	1.700
2002-01-01	2.000
2003-01-01	2.500
2004-01-01	3.200
2005-01-01	3.700
2006-01-01	3.100
2007-01-01	3.100
2008-01-01	2.600
2009-01-01	2.700
2010-01-01	3.500
2011-01-01	3.525
2012-01-01	3.350
2013-01-01	3.250
2014-01-01	3.325
2015-01-01	4.050
2016-01-01	3.800
2017-01-01	3.825