Year	Z-score
2008-01-01	19.6461
2009-01-01	24.2354
2010-01-01	24.3800
2011-01-01	24.8555
2012-01-01	25.4308
2013-01-01	25.2293
2014-01-01	24.7590
2015-01-01	24.4165
2016-01-01	22.4734