Quarter	Billions of US Dollars
1993-07-01	55.539
1993-10-01	55.754
1994-01-01	44.711
1994-04-01	69.913
1994-07-01	60.930
1994-10-01	60.494
1995-01-01	49.683
1995-04-01	46.019
1995-07-01	58.931
1995-10-01	46.580
1996-01-01	67.404
1996-04-01	68.152
1996-07-01	71.537
1996-10-01	91.797
1997-01-01	99.144
1997-04-01	91.023
1997-07-01	97.275
1997-10-01	13.282
1998-01-01	116.088
1998-04-01	125.757
1998-07-01	59.473
1998-10-01	24.503
1999-01-01	126.624
1999-04-01	158.638
1999-07-01	141.659
1999-10-01	67.532
2000-01-01	129.723
2000-04-01	114.742
2000-07-01	183.303
2000-10-01	141.390
2001-01-01	268.477
2001-04-01	232.755
2001-07-01	123.121
2001-10-01	187.029
2002-01-01	197.272
2002-04-01	198.394
2002-07-01	81.713
2002-10-01	107.976
2003-01-01	158.414
2003-04-01	216.827
2003-07-01	195.248
2003-10-01	189.402
2004-01-01	227.873
2004-04-01	123.587
2004-07-01	160.394
2004-10-01	177.392
2005-01-01	251.590
2005-04-01	165.932
2005-07-01	156.766
2005-10-01	224.068
2006-01-01	255.272
2006-04-01	206.115
2006-07-01	215.623
2006-10-01	299.876
2007-01-01	281.253
2007-04-01	423.977
2007-07-01	180.116
2007-10-01	220.254
2008-01-01	102.730
2008-04-01	450.024
2008-07-01	31.023
2008-10-01	43.560
2009-01-01	319.071
2009-04-01	508.566
2009-07-01	254.278
2009-10-01	305.046
2010-01-01	306.143
2010-04-01	99.131
2010-07-01	194.690
2010-10-01	157.430
2011-01-01	256.691
2011-04-01	144.407
2011-07-01	87.142
2011-10-01	57.360
2012-01-01	439.933
2012-04-01	126.219
2012-07-01	279.666
2012-10-01	298.044
2013-01-01	55.935
2013-04-01	159.381
2013-07-01	101.806
2013-10-01	218.238
2014-01-01	120.903
2014-04-01	217.304
2014-07-01	178.770
2014-10-01	89.941
2015-01-01	207.857
2015-04-01	236.403