Year	Z-score
1996-01-01	8.174000000000000
1997-01-01	7.879689999999999
1998-01-01	10.696900000000000
1999-01-01	15.694100000000000
2000-01-01	16.292600000000000
2001-01-01	15.167800000000000
2002-01-01	16.788300000000000
2003-01-01	16.954900000000000
2004-01-01	15.596600000000000
2005-01-01	12.251300000000000
2006-01-01	12.541200000000000
2007-01-01	13.870200000000000
2008-01-01	14.745100000000000
2009-01-01	15.365400000000000
2010-01-01	16.080000000000000
2011-01-01	17.095600000000000
2012-01-01	18.224900000000000
2013-01-01	18.229100000000000
2014-01-01	18.291800000000000
2015-01-01	17.456900000000000
2016-01-01	17.380900000000000