Year	Z-score
1996-01-01	16.8079
1997-01-01	20.1761
1998-01-01	20.7897
1999-01-01	16.5489
2000-01-01	15.9081
2001-01-01	16.4540
2002-01-01	13.7977
2003-01-01	11.3170
2004-01-01	13.9047
2005-01-01	14.9204
2006-01-01	17.8975
2007-01-01	16.9633
2008-01-01	16.9829
2009-01-01	14.4852
2010-01-01	15.4653
2011-01-01	14.6753
2012-01-01	15.9622
2013-01-01	14.8754
2014-01-01	14.8461
2015-01-01	14.0548
2016-01-01	14.8791