Year	Z-score
2005-01-01	6.736089999999999
2006-01-01	6.764730000000000
2007-01-01	7.435530000000000
2008-01-01	14.002300000000000
2009-01-01	11.799800000000000
2010-01-01	10.584500000000000
2011-01-01	10.575500000000000
2012-01-01	10.946700000000000
2013-01-01	9.108710000000000
2014-01-01	7.856930000000000
2015-01-01	11.469200000000000
2016-01-01	10.473900000000000