Year	Z-score
1996-01-01	10.7178
1997-01-01	12.2244
1998-01-01	12.1895
1999-01-01	12.6779
2000-01-01	19.0283
2001-01-01	18.7796
2002-01-01	18.7455
2003-01-01	19.5265
2004-01-01	17.5399
2005-01-01	17.8255
2006-01-01	19.1145
2007-01-01	18.3256
2008-01-01	18.5904
2009-01-01	18.0318
2010-01-01	19.3178
2011-01-01	19.5977
2012-01-01	19.6379
2013-01-01	18.4399
2014-01-01	17.8150
2015-01-01	15.8737
2016-01-01	18.4549