Year	Z-score
1996-01-01	29.7542
1997-01-01	23.0390
1998-01-01	21.1597
1999-01-01	19.9404
2000-01-01	14.9621
2001-01-01	15.7862
2002-01-01	16.0469
2003-01-01	16.8032
2004-01-01	20.2021
2005-01-01	17.0133
2006-01-01	14.5784
2007-01-01	12.6395
2008-01-01	26.9119
2009-01-01	33.7915
2010-01-01	34.4916
2011-01-01	32.8732
2012-01-01	35.0985
2013-01-01	28.5904
2014-01-01	29.4154
2015-01-01	31.8792
2016-01-01	34.7030