Year	Z-score
1996-01-01	27.12070
1997-01-01	26.35800
1998-01-01	24.16640
1999-01-01	19.81220
2000-01-01	18.06130
2001-01-01	10.89120
2002-01-01	9.22149
2003-01-01	12.66390
2004-01-01	9.58273
2005-01-01	12.60130
2006-01-01	17.80260
2007-01-01	20.01530
2008-01-01	18.09170
2009-01-01	16.82850
2010-01-01	18.83800
2011-01-01	18.25630
2012-01-01	19.10170
2013-01-01	19.49510
2014-01-01	20.15460
2015-01-01	22.59580
2016-01-01	20.82630