Year	Z-score
2005-01-01	17.5678000000000000
2006-01-01	12.2488000000000000
2007-01-01	15.9947000000000000
2008-01-01	14.3275000000000000
2009-01-01	10.5598000000000000
2010-01-01	10.7475000000000000
2011-01-01	10.7436000000000000
2012-01-01	10.1887000000000000
2013-01-01	10.9863000000000000
2014-01-01	10.8375000000000000
2015-01-01	9.2140200000000000
2016-01-01	7.4012199999999995