Year	Z-score
1996-01-01	18.4782
1997-01-01	13.3407
1998-01-01	13.3407
1999-01-01	13.3407
2000-01-01	26.7560
2001-01-01	27.9181
2002-01-01	27.3821
2003-01-01	25.4746
2004-01-01	16.8724
2005-01-01	18.2122
2006-01-01	19.1789
2007-01-01	22.0000
2008-01-01	20.3950
2009-01-01	22.8869
2010-01-01	18.4729
2011-01-01	21.3812
2012-01-01	20.1645
2013-01-01	18.7337
2014-01-01	16.8197
2015-01-01	16.0379
2016-01-01	16.6937