Quarter	Billions of US Dollars
1987-01-01	0.1440
1987-04-01	0.2380
1987-07-01	0.1230
1987-10-01	0.0630
1988-01-01	0.1690
1988-04-01	0.1440
1988-07-01	0.0590
1988-10-01	0.0630
1989-01-01	0.0510
1989-04-01	0.0480
1989-07-01	0.0560
1989-10-01	0.0540
1990-01-01	0.0360
1990-04-01	0.1010
1990-07-01	0.0910
1990-10-01	0.1020
1991-01-01	0.0640
1991-04-01	0.0770
1991-07-01	0.1110
1991-10-01	0.2480
1992-01-01	0.2850
1992-04-01	0.2710
1992-07-01	0.2130
1992-10-01	0.2390
1993-01-01	0.2500
1993-04-01	0.2490
1997-10-01	0.1767
1998-01-01	0.1722
1998-04-01	0.1753
1998-07-01	0.1875
2000-07-01	0.0100
2000-10-01	0.0100
2001-04-01	0.0500
2001-07-01	0.5066
2001-10-01	0.0353
2002-01-01	0.1372
2002-04-01	0.1141
2002-07-01	0.1134
2002-10-01	0.1305
2003-01-01	0.3153
2003-04-01	0.9222
2003-07-01	1.5710
2003-10-01	1.9495
2004-01-01	3.3816
2004-04-01	2.6371
2004-07-01	3.4422
2004-10-01	3.6462
2005-01-01	4.0343
2005-04-01	5.7766
2005-07-01	4.0038
2005-10-01	3.6187
2006-01-01	3.2403
2006-04-01	8.0734
2006-07-01	5.0712
2006-10-01	5.8647
2007-01-01	6.6134
2007-04-01	15.5075
2007-07-01	13.6818
2007-10-01	11.3487
2008-01-01	13.3277
2008-04-01	25.6634
2008-07-01	20.0806
2008-10-01	14.1815
2009-01-01	11.5014
2009-04-01	15.6866
2009-07-01	18.2734
2009-10-01	3.8340
2010-01-01	4.0757
2010-04-01	4.2689
2010-07-01	4.1516
2010-10-01	7.3959
2011-01-01	3.8103
2011-04-01	1.3960
2011-07-01	1.1184
2011-10-01	14.4415
2012-01-01	20.1417
2012-04-01	9.7113
2012-07-01	5.2244
2012-10-01	3.7027
2013-01-01	0.5810
2013-04-01	12.8371
2013-07-01	13.5410
2013-10-01	24.2444
2014-01-01	26.7827
2014-04-01	20.2871
2014-07-01	17.1066
2014-10-01	18.7300
2015-01-01	26.9772
2015-04-01	50.6867