Year	Z-score
1996-01-01	13.4204
1997-01-01	11.9448
1998-01-01	12.0479
1999-01-01	17.6711
2000-01-01	16.1231
2001-01-01	17.7754
2002-01-01	15.0642
2003-01-01	15.0754
2004-01-01	16.7640
2005-01-01	18.3846
2006-01-01	17.7379
2007-01-01	17.8211
2008-01-01	18.6149
2009-01-01	19.9728
2010-01-01	17.1816
2011-01-01	13.6850
2012-01-01	13.1952
2013-01-01	13.2269
2014-01-01	13.2702
2015-01-01	12.8631
2016-01-01	13.0017