Quarter	Billions of US Dollars
1993-07-01	0.63259
1993-10-01	0.04940
1994-01-01	0.44220
1994-04-01	0.04497
1994-07-01	0.11180
1994-10-01	0.14164
1995-01-01	0.00769
1995-04-01	0.48383
1995-07-01	0.88195
1995-10-01	1.20934
1996-01-01	0.67414
1996-04-01	0.88722
1996-07-01	1.29106
1996-10-01	1.44535
1997-01-01	1.50201
1997-04-01	1.00550
1997-07-01	0.93746
1997-10-01	1.04136
1998-01-01	0.35205
1998-04-01	0.06822
1998-07-01	0.21940
1998-10-01	0.38998
1999-01-01	0.20080
1999-04-01	0.15888
1999-07-01	0.30978
1999-10-01	0.25940
2000-01-01	0.41581
2000-04-01	0.02634
2000-07-01	0.09841
2000-10-01	0.14454
2001-01-01	0.18437
2001-04-01	0.08491
2001-07-01	0.21146
2001-10-01	0.25640
2002-01-01	0.12998
2002-04-01	0.14139
2002-07-01	0.00833
2002-10-01	0.16384
2003-01-01	0.15911
2003-04-01	0.16255
2003-07-01	0.08911
2003-10-01	0.17827
2004-01-01	0.09446
2004-04-01	0.23248
2004-07-01	0.01825
2004-10-01	0.10747
2005-01-01	0.08721
2005-04-01	0.22231
2005-07-01	0.40860
2005-10-01	0.32916
2006-01-01	0.03946
2006-04-01	1.43922
2006-07-01	0.14538
2006-10-01	0.24484
2007-01-01	0.37313
2007-04-01	0.52657
2007-07-01	0.05747
2007-10-01	0.23213
2008-01-01	0.77801
2008-04-01	0.16849
2008-07-01	0.17027
2008-10-01	0.39829
2009-01-01	0.11376
2009-04-01	0.12395
2009-07-01	0.00032
2009-10-01	0.02218
2010-01-01	0.00005
2010-04-01	0.04877
2010-07-01	0.03904
2010-10-01	0.00004
2011-04-01	0.00206
2012-01-01	1.45131
2012-04-01	0.24160
2012-07-01	0.38036
2012-10-01	0.03477
2013-04-01	0.15739
2013-07-01	0.00029
2013-10-01	0.12754
2014-04-01	0.00653
2014-07-01	0.01032
2015-01-01	0.00953
2015-04-01	0.01008