Year	Z-score
1996-01-01	9.97
1997-01-01	9.76
1998-01-01	10.03
1999-01-01	10.87
2000-01-01	11.00
2001-01-01	11.09
2002-01-01	11.08
2003-01-01	10.01
2004-01-01	10.26
2005-01-01	9.57
2006-01-01	10.36
2007-01-01	11.02
2008-01-01	8.31
2009-01-01	10.49
2010-01-01	10.14
2011-01-01	8.85
2012-01-01	10.12
2013-01-01	8.78
2014-01-01	11.00
2015-01-01	10.31