Year	Z-score
1996-01-01	19.81050
1997-01-01	18.54580
1998-01-01	18.61880
1999-01-01	16.17140
2000-01-01	11.07120
2001-01-01	9.39305
2002-01-01	13.74810
2003-01-01	17.91760
2004-01-01	5.58940
2005-01-01	18.45640
2006-01-01	16.77630
2007-01-01	15.28630
2008-01-01	14.13170
2009-01-01	15.30040
2010-01-01	15.80550
2011-01-01	14.83790
2012-01-01	14.32260
2013-01-01	14.16650
2014-01-01	13.90960
2015-01-01	13.83280
2016-01-01	14.72420