Year	Z-score
2003-01-01	4.9657000000000000
2004-01-01	4.5921400000000006
2005-01-01	4.0778300000000005
2006-01-01	3.7890200000000000
2007-01-01	3.2518200000000000
2008-01-01	4.0516100000000000
2009-01-01	3.6026500000000000
2010-01-01	2.6571700000000003
2011-01-01	4.1958400000000005
2012-01-01	44.4128000000000000
2013-01-01	17.4773000000000000