Quarter	Billions of US Dollars
1997-01-01	0.01088
1997-04-01	0.01180
1997-07-01	0.01116
1997-10-01	0.01039
1998-01-01	0.01022
1998-04-01	0.00958
1998-07-01	0.00998
1998-10-01	0.01168
1999-01-01	0.01121
1999-04-01	0.01115
1999-07-01	0.01263
1999-10-01	0.01321
2001-04-01	0.12720
2001-07-01	0.13697
2001-10-01	0.24236
2002-01-01	0.23991
2002-04-01	0.27431
2002-07-01	0.27115
2002-10-01	0.73424
2003-01-01	0.75035
2003-04-01	0.77137
2003-07-01	0.78025
2003-10-01	0.81888
2004-01-01	0.80285
2004-04-01	0.61780
2004-07-01	0.62402
2004-10-01	0.60798
2005-01-01	0.59189
2005-04-01	0.52481
2005-07-01	0.52359
2005-10-01	0.47188
2006-01-01	0.47940
2006-04-01	0.44860
2006-07-01	0.44730
2006-10-01	0.24946
2007-01-01	0.25124
2007-04-01	0.20776
2007-07-01	0.21585