Year	Percent
1998-01-01	110.90000000000000
1999-01-01	125.10000000000000
2000-01-01	81.40000000000000
2001-01-01	126.60000000000000
2002-01-01	155.90000000000000
2003-01-01	171.80000000000000
2004-01-01	214.50000000000000
2005-01-01	179.70000000000000
2006-01-01	179.90000000000000
2007-01-01	181.80000000000000
2008-01-01	182.50000000000000
2009-01-01	151.60000000000000
2010-01-01	164.86900000000003
2011-01-01	151.80900000000000
2012-01-01	149.14300000000000
2013-01-01	161.05100000000002
2014-01-01	155.78900000000000
2015-01-01	154.39300000000000
2016-01-01	152.16500000000000