Year	Index
1997-01-01	0.39493500000000000
1998-01-01	0.34217800000000004
1999-01-01	0.26102500000000000
2000-01-01	0.29977600000000004
2001-01-01	0.31859000000000000
2002-01-01	0.30535999999999996
2003-01-01	0.35909600000000000
2004-01-01	0.32053100000000000
2005-01-01	0.37121300000000000
2006-01-01	0.35295400000000000
2007-01-01	0.38361900000000000
2008-01-01	0.36880700000000000
2009-01-01	0.37581800000000000
2010-01-01	0.41322000000000000
2011-01-01	0.37719000000000000
2012-01-01	0.35019800000000000
2013-01-01	0.34405000000000000
2014-01-01	0.34899800000000000