Quarter	Billions of US Dollars
1997-04-01	0.026132
1997-07-01	0.025597
1997-10-01	0.025424
1998-01-01	0.050420
1998-04-01	0.049834
1998-07-01	0.051458
1998-10-01	0.052724
1999-01-01	0.050847
1999-04-01	0.050167
1999-07-01	0.025907
1999-10-01	0.025729
2000-01-01	0.025168
2000-04-01	0.025000
2000-07-01	0.040650
2000-10-01	0.040783
2001-01-01	0.015848
2001-04-01	0.015649
2001-07-01	0.016155
2001-10-01	0.015674
2002-01-01	0.015601
2002-04-01	0.016529
2003-07-01	0.008850
2003-10-01	0.009242
2004-01-01	0.009208
2004-04-01	0.009191
2004-07-01	0.009191
2004-10-01	0.009690
2005-01-01	0.009208
2005-04-01	0.008576
2005-07-01	0.008576
2005-10-01	0.008432
2006-01-01	0.008591
2006-04-01	0.008929
2006-07-01	0.009058
2006-10-01	0.009328
2007-01-01	0.009470
2007-04-01	0.009579
2007-07-01	0.006036
2007-10-01	0.006198
2008-01-01	0.006742
2008-04-01	0.006711