Year	Z-score
1996-01-01	20.9734
1997-01-01	23.9873
1998-01-01	27.4509
1999-01-01	29.9484
2000-01-01	30.7196
2001-01-01	29.1114
2002-01-01	32.6262
2003-01-01	29.5096
2004-01-01	29.7426
2005-01-01	29.5072
2006-01-01	38.3494
2007-01-01	42.8985
2008-01-01	27.3863
2009-01-01	24.6625
2010-01-01	29.6695
2011-01-01	27.6083
2012-01-01	23.9741
2013-01-01	28.2044
2014-01-01	26.5183
2015-01-01	27.6706
2016-01-01	22.7328