Year	Percent
1999-01-01	12.425
2000-01-01	11.600
2001-01-01	11.050
2002-01-01	11.350
2003-01-01	10.525
2004-01-01	11.075
2005-01-01	12.025
2006-01-01	12.375
2007-01-01	13.100
2008-01-01	12.200
2009-01-01	12.800
2010-01-01	13.050
2011-01-01	12.975
2012-01-01	12.875
2013-01-01	12.800
2014-01-01	12.675
2015-01-01	12.700
2016-01-01	12.400
2017-01-01	13.425