Year	Z-score
1996-01-01	18.4897
1997-01-01	20.0372
1998-01-01	9.8145
1999-01-01	13.2719
2000-01-01	12.5732
2001-01-01	12.6124
2002-01-01	13.3917
2003-01-01	14.4799
2004-01-01	12.8319
2005-01-01	12.6863
2006-01-01	13.8246
2007-01-01	15.0383
2008-01-01	15.7907
2009-01-01	16.5367
2010-01-01	15.6903
2011-01-01	15.0042
2012-01-01	14.4684
2013-01-01	15.8503
2014-01-01	18.2728
2015-01-01	14.0525
2016-01-01	13.5297