Quarter	Billions of US Dollars
1993-07-01	89.613
1993-10-01	80.178
1994-01-01	80.227
1994-04-01	81.883
1994-07-01	84.842
1994-10-01	82.352
1995-01-01	86.933
1995-04-01	94.667
1995-07-01	93.893
1995-10-01	100.123
1996-01-01	101.330
1996-04-01	99.920
1996-07-01	88.717
1996-10-01	97.556
1997-01-01	104.393
1997-04-01	109.351
1997-07-01	104.213
1997-10-01	94.150
1998-01-01	87.423
1998-04-01	82.251
1998-07-01	80.114
1998-10-01	94.295
1999-01-01	94.411
1999-04-01	101.446
1999-07-01	109.637
1999-10-01	113.442
2000-01-01	112.842
2000-04-01	128.145
2000-07-01	138.631
2000-10-01	162.917
2001-01-01	167.147
2001-04-01	162.200
2001-07-01	163.836
2001-10-01	160.084
2002-01-01	156.179
2002-04-01	163.861
2002-07-01	164.317
2002-10-01	167.905
2003-01-01	171.027
2003-04-01	198.138
2003-07-01	192.316
2003-10-01	207.094
2004-01-01	193.707
2004-04-01	181.866
2004-07-01	177.656
2004-10-01	187.499
2005-01-01	187.941
2005-04-01	192.371
2005-07-01	185.766
2005-10-01	195.683
2006-01-01	204.089
2006-04-01	213.186
2006-07-01	212.082
2006-10-01	190.625
2007-01-01	197.212
2007-04-01	199.781
2007-07-01	192.154
2007-10-01	210.804
2008-01-01	228.208
2008-04-01	238.946
2008-07-01	228.484
2008-10-01	221.658
2009-01-01	193.291
2009-04-01	194.883
2009-07-01	186.651
2009-10-01	187.342
2010-01-01	199.043
2010-04-01	212.362
2010-07-01	229.455
2010-10-01	222.157
2011-01-01	230.605
2011-04-01	239.215
2011-07-01	216.040
2011-10-01	211.449
2012-01-01	218.833
2012-04-01	233.698
2012-07-01	256.863
2012-10-01	265.758
2013-01-01	286.675
2013-04-01	323.279
2013-07-01	340.040
2013-10-01	358.001
2014-01-01	348.002
2014-04-01	312.857
2014-07-01	281.351
2014-10-01	251.731
2015-01-01	231.800
2015-04-01	244.536