Year	Index
1997-01-01	-0.048429
1998-01-01	-0.044707
1999-01-01	-0.054950
2000-01-01	-0.065439
2001-01-01	-0.064827
2002-01-01	-0.057698
2003-01-01	-0.069122
2004-01-01	-0.071021
2005-01-01	-0.070267
2006-01-01	-0.070515
2007-01-01	-0.068127
2008-01-01	-0.075500
2009-01-01	-0.052189
2010-01-01	-0.053195