Year	Z-score
1996-01-01	29.8052
1997-01-01	33.7915
1998-01-01	31.7392
1999-01-01	29.3441
2000-01-01	28.3221
2001-01-01	26.5114
2002-01-01	27.0914
2003-01-01	25.3772
2004-01-01	24.4650
2005-01-01	29.3277
2006-01-01	32.9026
2007-01-01	32.2553
2008-01-01	33.9166
2009-01-01	34.5780
2010-01-01	35.8194
2011-01-01	32.9371
2012-01-01	34.0806
2013-01-01	33.6243
2014-01-01	34.0803
2015-01-01	31.5604
2016-01-01	32.3186