Year	Z-score
1996-01-01	9.935
1997-01-01	9.835
1998-01-01	9.985
1999-01-01	10.450
2000-01-01	10.610
2001-01-01	10.410
2002-01-01	10.380
2003-01-01	10.480
2004-01-01	10.830
2005-01-01	10.640
2006-01-01	10.360
2007-01-01	11.310
2008-01-01	10.920
2009-01-01	10.940
2010-01-01	10.650
2011-01-01	10.960
2012-01-01	10.975
2013-01-01	10.870
2014-01-01	11.215
2015-01-01	10.755