Year	Percent
1999-01-01	5.800
2000-01-01	4.100
2001-01-01	5.500
2002-01-01	3.900
2003-01-01	8.700
2004-01-01	7.400
2005-01-01	9.100
2006-01-01	7.500
2007-01-01	7.400
2008-01-01	7.400
2009-01-01	9.000
2010-01-01	8.650
2011-01-01	7.875
2012-01-01	8.000
2013-01-01	8.750
2014-01-01	8.600
2015-01-01	8.375
2016-01-01	8.375
2017-01-01	8.000