Year	Percent
1999-01-01	7.700
2000-01-01	8.275
2001-01-01	8.675
2002-01-01	8.100
2003-01-01	8.250
2004-01-01	8.450
2005-01-01	8.300
2006-01-01	7.700
2007-01-01	7.650
2008-01-01	6.725
2009-01-01	7.850
2010-01-01	7.975
2011-01-01	8.450
2012-01-01	9.350
2013-01-01	9.850
2014-01-01	9.700
2015-01-01	9.200
2016-01-01	9.200
2017-01-01	10.400