Year	Z-score
1996-01-01	13.690300000000000
1997-01-01	13.493100000000000
1998-01-01	13.489300000000000
1999-01-01	9.604730000000000
2000-01-01	12.795600000000000
2001-01-01	13.734000000000002
2002-01-01	14.083900000000000
2003-01-01	14.556300000000000
2004-01-01	14.757100000000000
2005-01-01	17.550900000000000
2006-01-01	18.449300000000000
2007-01-01	16.461200000000000
2008-01-01	15.238900000000000
2009-01-01	16.064000000000000
2010-01-01	17.020500000000000
2011-01-01	17.601700000000000
2012-01-01	17.557000000000002
2013-01-01	17.426300000000000
2014-01-01	17.407500000000000
2015-01-01	18.167000000000000
2016-01-01	18.985200000000000