Year	Z-score
2007-01-01	12.3464
2008-01-01	13.5979
2009-01-01	10.3719
2010-01-01	10.3719
2011-01-01	10.3719
2012-01-01	10.3719
2013-01-01	10.3719
2014-01-01	10.9329
2015-01-01	12.3953
2016-01-01	11.6008