Quarter	Billions of US Dollars
1976-10-01	0.03470
1977-01-01	0.02830
1978-01-01	0.02510
1978-07-01	0.02980
1980-01-01	0.02230
1986-10-01	-0.03410
1987-01-01	-0.02667
1988-01-01	-0.02546
1988-07-01	-0.02667
1990-01-01	-0.02525
1996-07-01	0.29047
1999-04-01	0.15153
2001-10-01	-2.04747
2002-01-01	-9.35098
2002-07-01	-0.22490
2003-07-01	0.46490
2004-04-01	-0.16700
2007-04-01	0.67073
2008-07-01	-0.60051
2010-10-01	1.34689
2012-10-01	1.50000
2013-04-01	0.75000
2013-10-01	0.30000
2014-04-01	2.90400
2014-07-01	0.07376
2015-04-01	1.00000