Year	Percent
1997-01-01	142.14100000000000
1998-01-01	139.52200000000002
1999-01-01	139.52200000000002
2000-01-01	139.52200000000002
2001-01-01	79.27820000000000
2002-01-01	148.35399999999998
2003-01-01	136.80800000000000
2004-01-01	132.10299999999998
2005-01-01	134.44000000000000
2006-01-01	124.82500000000000
2007-01-01	114.14900000000000
2008-01-01	112.71600000000001
2009-01-01	118.72600000000000
2010-01-01	113.11700000000000
2011-01-01	105.60300000000000
2012-01-01	101.67399999999999
2013-01-01	102.93700000000001
2014-01-01	110.07300000000000
2015-01-01	105.69800000000000
2016-01-01	99.32000000000000