Year	Percent
1998-01-01	4.300
1999-01-01	4.175
2000-01-01	3.400
2001-01-01	3.375
2002-01-01	4.400
2003-01-01	5.825
2004-01-01	6.175
2005-01-01	7.075
2006-01-01	6.975
2007-01-01	7.025
2008-01-01	6.900
2009-01-01	9.400
2010-01-01	10.400
2011-01-01	13.175
2012-01-01	16.550
2013-01-01	17.000
2014-01-01	14.225
2015-01-01	12.750
2016-01-01	11.525
2017-01-01	8.800