Year	Z-score
1996-01-01	22.9297
1997-01-01	23.6629
1998-01-01	25.6553
1999-01-01	22.3668
2000-01-01	25.7277
2001-01-01	24.9050
2002-01-01	33.7214
2003-01-01	28.8647
2004-01-01	18.7259
2005-01-01	17.0547
2006-01-01	18.1970
2007-01-01	18.1463
2008-01-01	14.6737
2009-01-01	15.9369
2010-01-01	17.2888
2011-01-01	18.8609
2012-01-01	20.3823
2013-01-01	17.2594
2014-01-01	17.2842
2015-01-01	17.8553
2016-01-01	17.7385