Year	Z-score
2003-01-01	10.980600000000000
2004-01-01	18.902700000000000
2005-01-01	14.805700000000000
2006-01-01	10.661100000000000
2007-01-01	9.510410000000000
2008-01-01	14.085700000000000
2009-01-01	12.014500000000000
2010-01-01	11.249300000000000
2011-01-01	10.119600000000000
2012-01-01	10.286700000000000
2013-01-01	11.414000000000001
2014-01-01	12.942900000000000
2015-01-01	12.808100000000000
2016-01-01	13.990900000000000