Year	Z-score
1999-01-01	9.60128212
2000-01-01	24.48699760
2001-01-01	10.21233845
2002-01-01	16.18528366
2003-01-01	10.09115410
2004-01-01	8.22995472
2005-01-01	11.86032963
2006-01-01	13.50047874
2007-01-01	12.67066765
2008-01-01	12.85417652
2009-01-01	12.02421188
2010-01-01	13.87029266
2011-01-01	14.16513824
2012-01-01	11.72677803
2013-01-01	11.85945511