Year	Z-score
1996-01-01	10.5338
1997-01-01	12.1168
1998-01-01	12.7739
1999-01-01	12.6130
2000-01-01	13.5277
2001-01-01	14.0320
2002-01-01	14.1014
2003-01-01	13.8611
2004-01-01	13.5512
2005-01-01	13.8621
2006-01-01	14.0674
2007-01-01	13.4221
2008-01-01	14.4711
2009-01-01	17.2588
2010-01-01	16.7259
2011-01-01	15.5587
2012-01-01	14.8732
2013-01-01	15.2478
2014-01-01	10.7652
2015-01-01	11.9452
2016-01-01	12.4956