Year	Z-score
1996-01-01	18.0264
1997-01-01	17.4751
1998-01-01	19.9913
1999-01-01	18.4724
2000-01-01	20.2016
2001-01-01	21.6930
2002-01-01	24.3697
2003-01-01	24.7984
2004-01-01	24.6141
2005-01-01	24.9431
2006-01-01	26.8541
2007-01-01	25.6308
2008-01-01	23.2584
2009-01-01	28.4955
2010-01-01	30.0378
2011-01-01	28.9075
2012-01-01	34.8483
2013-01-01	37.3701
2014-01-01	38.6945
2015-01-01	39.4077
2016-01-01	46.9539