Year	Z-score
1996-01-01	21.7011
1997-01-01	21.4166
1998-01-01	21.2789
1999-01-01	23.7060
2000-01-01	24.4355
2001-01-01	24.5730
2002-01-01	29.8681
2003-01-01	22.9416
2004-01-01	22.9314
2005-01-01	22.9576
2006-01-01	24.9172
2007-01-01	23.9864
2008-01-01	24.9024
2009-01-01	23.2269
2010-01-01	24.1321
2011-01-01	26.0111
2012-01-01	26.1675
2013-01-01	25.6676
2014-01-01	25.3053
2015-01-01	28.4706
2016-01-01	29.9027