Year	Z-score
1997-01-01	19.511900000000000
1998-01-01	19.511900000000000
1999-01-01	18.329000000000000
2000-01-01	13.818900000000000
2001-01-01	12.810400000000000
2002-01-01	11.883000000000000
2003-01-01	9.004330000000000
2004-01-01	9.316780000000000
2005-01-01	9.072360000000000
2006-01-01	9.872119999999999
2007-01-01	11.514500000000000
2008-01-01	10.478100000000000
2009-01-01	10.537900000000000
2010-01-01	10.212100000000000
2011-01-01	9.394570000000000
2012-01-01	10.013000000000000
2013-01-01	11.614600000000000
2014-01-01	12.173700000000000
2015-01-01	11.903400000000000
2016-01-01	12.964700000000000