Quarter	Billions of US Dollars
1997-01-01	0.016000
1997-04-01	0.021418
1997-07-01	0.021418
1997-10-01	0.021418
1998-01-01	0.021418
1998-04-01	0.022257
1998-07-01	0.021748
1998-10-01	0.021748
1999-01-01	0.021748
1999-04-01	0.020779
1999-07-01	0.020779
1999-10-01	0.020779
2000-01-01	0.020779
2000-04-01	0.016000
2000-07-01	0.016000
2000-10-01	0.016000
2001-01-01	0.016000
2001-04-01	0.016000
2001-07-01	0.015700
2001-10-01	0.016000
2002-01-01	0.016000
2002-04-01	0.016000
2002-07-01	0.016000
2002-10-01	0.016000
2003-01-01	0.016000
2003-04-01	0.016000
2003-07-01	0.016000
2003-10-01	0.016000
2004-01-01	0.016000
2004-04-01	0.016000
2004-07-01	0.016000
2004-10-01	0.016000