Year	Z-score
1996-01-01	11.6234
1997-01-01	14.6936
1998-01-01	14.9471
1999-01-01	13.8114
2000-01-01	13.0828
2001-01-01	14.8927
2002-01-01	12.1139
2003-01-01	13.4994
2004-01-01	10.5425
2005-01-01	13.1228
2006-01-01	17.2715
2007-01-01	18.3676
2008-01-01	16.9468
2009-01-01	18.1609
2010-01-01	15.8070
2011-01-01	17.4398
2012-01-01	17.6174
2013-01-01	19.1062
2014-01-01	19.5235
2015-01-01	18.5666
2016-01-01	23.5881