Quarter	Billions of US Dollars
1987-01-01	0.24100
1987-04-01	0.25200
1987-07-01	0.20100
1987-10-01	0.27300
1988-01-01	0.27900
1988-04-01	0.24200
1988-07-01	0.20800
1988-10-01	0.20900
1989-01-01	0.25400
1989-04-01	0.29000
1989-07-01	0.28100
1989-10-01	0.17200
1990-01-01	0.24200
1990-04-01	0.20400
1990-07-01	0.13800
1990-10-01	0.03600
1991-01-01	0.16700
1991-04-01	0.16800
1991-07-01	0.11200
1991-10-01	0.10500
1992-01-01	0.08300
1992-04-01	0.11300
1992-07-01	0.10200
1992-10-01	0.06800
1993-01-01	0.09900
1993-04-01	0.10000
1993-07-01	0.09700
1993-10-01	0.09700
1994-01-01	0.09050
1994-04-01	0.09050
1994-07-01	0.01000
1994-10-01	0.01000
1995-01-01	0.00750
1995-04-01	0.00750
1995-07-01	0.00500
1995-10-01	0.00500
2005-04-01	0.02500
2005-07-01	0.02500
2005-10-01	0.02500
2006-01-01	0.02500
2006-07-01	0.01541
2006-10-01	0.01544
2007-01-01	0.03534
2007-04-01	0.03533
2007-07-01	0.02009
2007-10-01	0.02000
2010-07-01	0.02657
2010-10-01	0.02718
2011-01-01	0.02774
2011-04-01	0.02847
2012-01-01	0.01288