Year	Z-score
1996-01-01	14.243600000000000
1997-01-01	14.485000000000000
1998-01-01	12.910000000000000
1999-01-01	13.225300000000000
2000-01-01	13.381100000000000
2001-01-01	14.854900000000000
2002-01-01	12.816800000000000
2003-01-01	13.827300000000000
2004-01-01	13.274400000000000
2005-01-01	14.741300000000000
2006-01-01	15.166400000000000
2007-01-01	15.745800000000000
2008-01-01	15.096100000000000
2009-01-01	16.177000000000000
2010-01-01	18.931100000000000
2011-01-01	16.772000000000002
2012-01-01	18.212600000000000
2013-01-01	18.885800000000000
2014-01-01	20.839500000000000
2015-01-01	19.051600000000000
2016-01-01	21.339400000000000