Year	Z-score
1996-01-01	36.2955
1997-01-01	35.0360
1998-01-01	32.2525
1999-01-01	41.1899
2000-01-01	42.8991
2001-01-01	45.0059
2002-01-01	49.1729
2003-01-01	53.7354
2004-01-01	50.7787
2005-01-01	48.1442
2006-01-01	45.7271
2007-01-01	47.4525
2008-01-01	43.4341
2009-01-01	41.3204
2010-01-01	43.6196
2011-01-01	43.3489
2012-01-01	43.3351
2013-01-01	41.1899
2014-01-01	44.7033
2015-01-01	45.5975
2016-01-01	47.3366