Year	Percent
1999-01-01	3093.19
2000-01-01	2676.51
2001-01-01	2589.94
2002-01-01	2342.22
2003-01-01	3450.17
2004-01-01	3371.46
2005-01-01	2785.26
2006-01-01	2692.87
2007-01-01	2614.95
2008-01-01	2599.66
2009-01-01	2856.73
2010-01-01	2658.29
2011-01-01	2388.73
2012-01-01	1971.38
2013-01-01	1648.32
2014-01-01	1581.47
2015-01-01	1519.62
2016-01-01	1435.52