Year	Z-score
1996-01-01	13.7878
1997-01-01	12.5971
1998-01-01	11.9127
1999-01-01	12.2255
2000-01-01	13.1065
2001-01-01	12.9955
2002-01-01	13.6931
2003-01-01	15.3087
2004-01-01	16.7046
2005-01-01	15.4308
2006-01-01	16.2346
2007-01-01	15.4145
2008-01-01	14.4481
2009-01-01	16.6527
2010-01-01	15.9742
2011-01-01	16.3370
2012-01-01	15.9817
2013-01-01	15.2587
2014-01-01	15.5539
2015-01-01	15.3185
2016-01-01	17.4114