Year	Index
1997-01-01	0.55608000000000000
1998-01-01	0.27116900000000000
1999-01-01	0.26832700000000000
2000-01-01	0.40496600000000000
2001-01-01	0.47717600000000004
2002-01-01	0.54628199999999990
2003-01-01	0.56730700000000000
2004-01-01	0.51026900000000000
2005-01-01	0.29219500000000000
2006-01-01	0.41807000000000000
2007-01-01	0.43015200000000003
2008-01-01	0.47415500000000000
2009-01-01	0.47082799999999997
2010-01-01	0.41080600000000006
2011-01-01	0.38471500000000003
2012-01-01	0.39503499999999997
2013-01-01	0.35859500000000000