Year	Percent
1999-01-01	6.500
2000-01-01	5.800
2001-01-01	5.800
2002-01-01	7.100
2003-01-01	8.300
2004-01-01	8.000
2005-01-01	8.500
2006-01-01	7.900
2007-01-01	6.900
2008-01-01	6.700
2009-01-01	8.000
2010-01-01	7.775
2011-01-01	7.500
2012-01-01	8.600
2013-01-01	8.700
2014-01-01	8.625
2015-01-01	9.200
2016-01-01	8.725
2017-01-01	8.125