Year	Z-score
1996-01-01	11.693400000000000
1997-01-01	13.251300000000000
1998-01-01	15.381200000000000
1999-01-01	17.666900000000000
2000-01-01	15.538500000000000
2001-01-01	16.592600000000000
2002-01-01	17.670900000000000
2003-01-01	18.222700000000000
2004-01-01	17.455600000000000
2005-01-01	17.107200000000000
2006-01-01	18.283100000000000
2007-01-01	17.208600000000000
2008-01-01	17.221900000000000
2009-01-01	16.659000000000002
2010-01-01	14.932400000000000
2011-01-01	14.266800000000000
2012-01-01	12.816400000000000
2013-01-01	12.305800000000000
2014-01-01	12.637000000000000
2015-01-01	15.181400000000000
2016-01-01	15.214800000000000