Quarter	Billions of US Dollars
1988-04-01	0.01000
1988-07-01	0.00500
1998-10-01	0.00899
1999-01-01	0.01926
1999-04-01	0.01430
1999-07-01	0.03973
1999-10-01	0.04306
2000-01-01	0.06627
2000-04-01	0.06848
2000-07-01	0.05418
2000-10-01	0.33215
2001-04-01	0.01348
2001-07-01	0.01413
2001-10-01	0.01381
2002-01-01	0.02245
2002-04-01	0.02495
2002-07-01	0.03831
2002-10-01	0.03499
2003-01-01	0.04187
2003-04-01	0.05563
2003-07-01	0.06497
2003-10-01	0.07547
2004-01-01	0.09779
2004-04-01	0.10089
2004-07-01	0.10672
2004-10-01	0.11714
2005-01-01	0.05575
2005-04-01	0.01209
2006-07-01	0.02532
2006-10-01	0.52634
2007-01-01	0.52664
2007-04-01	0.52701
2007-07-01	0.54254
2007-10-01	0.04416
2008-01-01	0.04744
2008-04-01	0.04729
2010-07-01	0.01528
2010-10-01	0.01578
2011-01-01	0.12400
2011-04-01	0.30900
2011-07-01	0.70900
2011-10-01	0.71398
2012-01-01	0.61143
2012-04-01	0.52813
2012-07-01	0.12951
2012-10-01	0.13390
2013-01-01	0.11469
2013-04-01	0.11393
2013-07-01	0.11538
2013-10-01	0.11757