Year	Z-score
2007-01-01	8.647910000000001
2008-01-01	8.033240000000000
2009-01-01	6.274140000000000
2010-01-01	7.167980000000000
2011-01-01	4.010190000000001
2012-01-01	8.008400000000000
2013-01-01	9.970070000000000
2014-01-01	9.424090000000000
2015-01-01	11.308000000000000
2016-01-01	14.361300000000000