Year	Z-score
1997-01-01	6.147110000000000
1998-01-01	8.027880000000000
1999-01-01	9.179490000000000
2000-01-01	9.534189999999999
2001-01-01	9.739130000000001
2002-01-01	10.038900000000000
2003-01-01	10.556900000000000
2004-01-01	12.809200000000000
2005-01-01	11.401900000000000
2006-01-01	11.222300000000000
2007-01-01	12.124500000000000
2008-01-01	10.335900000000000
2009-01-01	13.407100000000000
2010-01-01	10.992300000000000
2011-01-01	12.175700000000000
2012-01-01	8.696390000000000
2013-01-01	8.564380000000000
2014-01-01	7.827470000000000
2015-01-01	9.073170000000000
2016-01-01	8.887810000000000