Year	Z-score
1996-01-01	19.9561
1997-01-01	19.4339
1998-01-01	17.2906
1999-01-01	16.7443
2000-01-01	12.8448
2001-01-01	14.1472
2002-01-01	18.0422
2003-01-01	15.5308
2004-01-01	15.1500
2005-01-01	14.0631
2006-01-01	13.5634
2007-01-01	10.2789
2008-01-01	12.5396
2009-01-01	15.4445
2010-01-01	15.0049
2011-01-01	17.0359
2012-01-01	17.2963
2013-01-01	17.3147
2014-01-01	16.1893
2015-01-01	15.8886
2016-01-01	12.4602