Year	Percent
1998-01-01	1.900
1999-01-01	1.800
2000-01-01	1.800
2001-01-01	1.600
2002-01-01	1.900
2003-01-01	3.000
2004-01-01	3.700
2005-01-01	3.500
2006-01-01	3.600
2007-01-01	3.550
2008-01-01	4.325
2009-01-01	4.400
2010-01-01	3.800
2011-01-01	3.850
2012-01-01	4.525
2013-01-01	5.425
2014-01-01	5.925
2015-01-01	6.100
2016-01-01	6.000
2017-01-01	5.575