Year	Index
1997-01-01	0.41317500000000000
1998-01-01	0.31836300000000000
1999-01-01	0.31043100000000000
2000-01-01	0.44556100000000000
2001-01-01	0.51047200000000000
2002-01-01	0.31873000000000000
2003-01-01	0.23593800000000000
2004-01-01	0.17932200000000000
2005-01-01	0.20328500000000000
2006-01-01	0.28454200000000000
2007-01-01	0.31917300000000000
2008-01-01	0.24770200000000000
2009-01-01	0.21894699999999997
2010-01-01	0.20773500000000000