Year	Percent
1997-01-01	112.24500000000000
1998-01-01	40.40090000000000
1999-01-01	46.10140000000000
2000-01-01	48.52930000000000
2001-01-01	48.87320000000000
2002-01-01	48.11270000000000
2003-01-01	49.80790000000000
2004-01-01	53.99520000000000
2005-01-01	55.12380000000000
2006-01-01	50.88600000000000
2007-01-01	51.28770000000000
2008-01-01	54.92000000000000
2009-01-01	57.24930000000000
2010-01-01	64.52010000000000
2011-01-01	64.65950000000000
2012-01-01	62.74100000000001
2013-01-01	62.44550000000000
2014-01-01	63.24550000000000