Year	Z-score
1996-01-01	15.555700000000000
1997-01-01	15.139200000000000
1998-01-01	16.184600000000000
1999-01-01	14.849100000000000
2000-01-01	16.178800000000000
2001-01-01	16.275100000000000
2002-01-01	17.403000000000000
2003-01-01	18.811900000000000
2004-01-01	20.322700000000000
2005-01-01	21.880500000000000
2006-01-01	24.311400000000000
2007-01-01	23.618000000000002
2008-01-01	24.914100000000000
2009-01-01	25.101900000000000
2010-01-01	27.988500000000000
2011-01-01	30.498100000000000
2012-01-01	28.565200000000000
2013-01-01	27.857400000000000
2014-01-01	25.996800000000000
2015-01-01	23.587100000000000
2016-01-01	21.690700000000000