Year	Z-score
1996-01-01	10.533300000000000
1997-01-01	10.268600000000000
1998-01-01	8.168820000000000
1999-01-01	9.550950000000000
2000-01-01	12.369000000000002
2001-01-01	6.514640000000000
2002-01-01	17.099400000000000
2003-01-01	21.927400000000000
2004-01-01	17.943800000000000