Year	Z-score
1996-01-01	25.3175
1997-01-01	25.9841
1998-01-01	28.9183
1999-01-01	28.7038
2000-01-01	24.7290
2001-01-01	25.2739
2002-01-01	25.4963
2003-01-01	27.2739
2004-01-01	32.8577
2005-01-01	37.9483
2006-01-01	28.2144
2007-01-01	28.4524
2008-01-01	26.4198
2009-01-01	26.8063
2010-01-01	26.7543
2011-01-01	29.5239
2012-01-01	27.4283
2013-01-01	25.3544
2014-01-01	24.4939
2015-01-01	23.4965
2016-01-01	20.9541