Year	Percent
1997-01-01	101.34700000000001
1998-01-01	143.19500000000000
1999-01-01	152.50900000000000
2000-01-01	137.89000000000000
2001-01-01	144.46500000000000
2002-01-01	139.52500000000000
2003-01-01	52.03630000000000
2004-01-01	68.42950000000000
2005-01-01	70.90770000000000
2006-01-01	66.60900000000000
2007-01-01	61.37730000000000
2008-01-01	38.03810000000000
2009-01-01	39.58660000000000
2010-01-01	27.76690000000000
2011-01-01	35.51980000000000
2012-01-01	34.76590000000000
2013-01-01	20.16560000000000
2014-01-01	20.37290000000000
2015-01-01	26.49540000000000
2016-01-01	19.98390000000000