Quarter	Billions of US Dollars
1997-01-01	0.01788
1997-04-01	0.03268
1997-07-01	0.10063
1997-10-01	0.20378
1998-01-01	0.22728
1998-04-01	0.25022
1998-07-01	0.27166
1998-10-01	0.27184
1999-01-01	0.28053
1999-04-01	0.22967
1999-07-01	0.22358
1999-10-01	0.20323
2000-01-01	0.17493
2000-04-01	0.29390
2000-07-01	0.26123
2000-10-01	0.30462
2001-01-01	0.40152
2001-04-01	0.30901
2001-07-01	0.33235
2001-10-01	0.28100
2002-01-01	0.26512
2002-04-01	0.29210
2002-07-01	0.29861
2002-10-01	0.31690
2003-01-01	0.65586
2003-04-01	0.47861
2003-07-01	0.49015
2003-10-01	0.90482
2004-01-01	0.88572
2004-04-01	1.18791
2004-07-01	1.28190
2004-10-01	2.02578
2005-01-01	2.31330
2005-04-01	1.74509
2005-07-01	1.60644
2005-10-01	1.53882
2006-01-01	1.13996
2006-04-01	1.19817
2006-07-01	1.19299
2006-10-01	1.24217
2007-01-01	1.14535
2007-04-01	1.09391
2007-07-01	1.14850
2007-10-01	1.19240
2008-01-01	1.28077
2008-04-01	1.26112
2008-07-01	1.14424
2008-10-01	1.11336
2009-01-01	0.99810
2009-04-01	1.06005
2009-07-01	1.09823