Year	Z-score
1996-01-01	16.4030
1997-01-01	14.6144
1998-01-01	13.9863
1999-01-01	18.6248
2000-01-01	17.0443
2001-01-01	16.5212
2002-01-01	16.3479
2003-01-01	17.0725
2004-01-01	17.1750
2005-01-01	16.1685
2006-01-01	14.6927
2007-01-01	16.3224
2008-01-01	18.3292
2009-01-01	18.7292
2010-01-01	18.9426
2011-01-01	18.6365
2012-01-01	18.1180
2013-01-01	18.5452
2014-01-01	18.6566
2015-01-01	18.5345
2016-01-01	17.8179