Year	Z-score
1996-01-01	13.5002
1997-01-01	16.0271
1998-01-01	16.5795
1999-01-01	16.1094
2000-01-01	18.9538
2001-01-01	18.7430
2002-01-01	15.5179
2003-01-01	13.6298
2004-01-01	15.7778
2005-01-01	16.5371
2006-01-01	14.4832
2007-01-01	12.1636
2008-01-01	15.3998
2009-01-01	17.0309
2010-01-01	15.5889
2011-01-01	19.7128
2012-01-01	18.0545
2013-01-01	14.6751
2014-01-01	15.4799
2015-01-01	18.8182
2016-01-01	17.7100