Year	Z-score
1999-01-01	21.2962
2000-01-01	29.0262
2001-01-01	21.5928
2002-01-01	21.6453
2003-01-01	20.7452
2004-01-01	18.9454
2005-01-01	30.8657
2006-01-01	28.5572
2007-01-01	22.5606
2008-01-01	24.1516
2009-01-01	21.7055
2010-01-01	20.1632
2011-01-01	20.2453
2012-01-01	19.7581
2013-01-01	18.9255
2014-01-01	19.8265
2015-01-01	22.0427
2016-01-01	21.1871