Quarter	Billions of US Dollars
1972-04-01	0.0158
1973-01-01	0.0307
1973-04-01	0.0200
1973-07-01	0.0162
1976-10-01	0.0576
1977-01-01	0.1464
1977-04-01	0.1798
1978-07-01	0.1503
1979-07-01	0.1046
1980-01-01	0.0173
1980-04-01	0.0530
1980-07-01	0.0176
1980-10-01	0.0114
1981-01-01	0.0144
1981-10-01	0.0850
1982-01-01	0.1067
1982-04-01	0.0159
1982-07-01	0.0104
1982-10-01	0.0751
1983-04-01	0.0102
1983-07-01	0.0623
1983-10-01	0.0779
1984-04-01	0.1109
1984-07-01	0.0098
1984-10-01	0.0339
1985-04-01	0.0535
1985-07-01	0.0358
1985-10-01	0.0589
1986-04-01	0.0122
1986-10-01	0.0050
1988-01-01	0.0296
1988-07-01	0.0078
1989-04-01	0.0678
1989-07-01	0.3250
1990-04-01	0.0278
1990-07-01	0.0092
1990-10-01	0.0098
1991-01-01	0.0118
1991-04-01	0.0685
1991-10-01	0.0230
1992-01-01	0.1734
1992-04-01	0.0462
1992-10-01	0.0892
1993-01-01	0.1664
1993-04-01	0.2407
1993-07-01	0.0460
1993-10-01	0.1389
1994-04-01	0.2335
1994-07-01	0.1200
1994-10-01	0.7013
1995-01-01	0.7751
1995-04-01	0.3526
1995-07-01	0.1560
1995-10-01	0.3120
1996-01-01	0.2369
1996-04-01	1.6080
1996-07-01	0.7876
1996-10-01	0.2619
1997-01-01	0.1259
1997-04-01	0.1677
1997-07-01	0.3222
1997-10-01	0.8055
1998-01-01	0.3914
1998-04-01	0.1645
1998-07-01	0.1794
1998-10-01	0.0556
1999-01-01	0.1808
1999-04-01	0.1886
1999-07-01	0.1651
1999-10-01	0.5424
2000-01-01	0.6952
2000-04-01	1.0525
2000-07-01	0.5042
2000-10-01	2.3776
2001-01-01	2.2849
2001-04-01	1.6276
2001-07-01	2.2096
2001-10-01	4.6219
2002-01-01	2.1057
2002-04-01	4.2411
2002-07-01	1.9024
2002-10-01	3.1016
2003-01-01	1.9589
2003-04-01	1.7146
2003-07-01	2.9251
2003-10-01	5.8626
2004-01-01	2.3226
2004-04-01	5.4043
2004-07-01	1.3756
2004-10-01	4.5712
2005-01-01	3.4736
2005-04-01	3.9131
2005-07-01	5.6024
2005-10-01	5.6978
2006-01-01	4.8471
2006-04-01	5.2156
2006-07-01	11.2317
2006-10-01	4.6041
2007-01-01	3.7403
2007-04-01	3.0055
2007-07-01	3.4936
2007-10-01	2.2018
2008-01-01	3.0454
2008-04-01	5.6609
2008-07-01	0.8941
2008-10-01	7.8245
2009-01-01	2.2285
2009-04-01	9.2598
2009-07-01	2.4889
2009-10-01	3.1970
2010-01-01	1.9044
2010-04-01	3.4690
2010-07-01	3.3040
2010-10-01	3.6075
2011-01-01	6.9472
2011-04-01	2.5644
2011-07-01	1.0782
2011-10-01	2.6122
2012-01-01	5.2879
2012-04-01	0.3482
2012-07-01	1.4222
2012-10-01	2.3403
2013-01-01	8.4085
2013-04-01	11.2751
2013-07-01	7.1733
2013-10-01	14.0152
2014-01-01	13.0499
2014-04-01	9.9684
2014-07-01	10.6051
2014-10-01	9.0880
2015-01-01	12.4320
2015-04-01	17.2417