Year	Z-score
1996-01-01	33.6315
1997-01-01	32.6891
1998-01-01	43.4619
1999-01-01	42.2387
2000-01-01	41.5884
2001-01-01	39.4204
2002-01-01	37.6470
2003-01-01	37.5652
2004-01-01	35.2157
2005-01-01	35.4450
2006-01-01	32.9045
2007-01-01	35.7614
2008-01-01	34.8909
2009-01-01	35.7162
2010-01-01	34.8346
2011-01-01	32.6265
2012-01-01	29.2095
2013-01-01	29.7300
2014-01-01	33.9679
2015-01-01	33.5013
2016-01-01	34.4911