Year	Percent
1998-01-01	3.400
1999-01-01	2.700
2000-01-01	2.325
2001-01-01	1.825
2002-01-01	2.450
2003-01-01	3.500
2004-01-01	4.325
2005-01-01	4.450
2006-01-01	3.550
2007-01-01	2.825
2008-01-01	2.550
2009-01-01	3.375
2010-01-01	4.400
2011-01-01	4.625
2012-01-01	5.475
2013-01-01	7.175
2014-01-01	7.175
2015-01-01	6.550
2016-01-01	5.600
2017-01-01	4.500