Year	Z-score
2001-01-01	7.413310000000001
2002-01-01	11.363700000000000
2003-01-01	18.400300000000000
2004-01-01	19.565500000000000
2005-01-01	18.863500000000000
2006-01-01	18.067200000000000
2007-01-01	18.494200000000000
2008-01-01	18.494200000000000
2009-01-01	18.494200000000000
2010-01-01	21.216200000000000
2011-01-01	20.387100000000000
2012-01-01	24.728500000000000
2013-01-01	26.670700000000000
2014-01-01	25.668300000000000
2015-01-01	24.335200000000000
2016-01-01	24.098200000000000