Quarter	Billions of US Dollars
1993-07-01	42.390
1993-10-01	55.699
1994-01-01	53.344
1994-04-01	76.649
1994-07-01	38.561
1994-10-01	43.802
1995-01-01	40.410
1995-04-01	39.277
1995-07-01	47.456
1995-10-01	44.653
1996-01-01	74.593
1996-04-01	100.048
1996-07-01	100.194
1996-10-01	93.243
1997-01-01	107.191
1997-04-01	119.030
1997-07-01	120.877
1997-10-01	72.323
1998-01-01	129.352
1998-04-01	131.558
1998-07-01	89.136
1998-10-01	88.622
1999-01-01	143.049
1999-04-01	134.692
1999-07-01	123.692
1999-10-01	82.554
2000-01-01	158.003
2000-04-01	143.447
2000-07-01	164.298
2000-10-01	148.212
2001-01-01	269.246
2001-04-01	276.969
2001-07-01	176.259
2001-10-01	193.503
2002-01-01	237.848
2002-04-01	201.688
2002-07-01	141.026
2002-10-01	162.378
2003-01-01	241.183
2003-04-01	209.725
2003-07-01	207.554
2003-10-01	203.384
2004-01-01	258.449
2004-04-01	205.594
2004-07-01	192.940
2004-10-01	200.716
2005-01-01	226.093
2005-04-01	207.787
2005-07-01	234.939
2005-10-01	281.169
2006-01-01	271.028
2006-04-01	333.396
2006-07-01	317.334
2006-10-01	408.068
2007-01-01	410.046
2007-04-01	457.475
2007-07-01	263.809
2007-10-01	220.142
2008-01-01	252.578
2008-04-01	334.572
2008-07-01	194.062
2008-10-01	154.227
2009-01-01	321.739
2009-04-01	361.670
2009-07-01	276.629
2009-10-01	296.915
2010-01-01	322.421
2010-04-01	247.851
2010-07-01	338.993
2010-10-01	266.439
2011-01-01	395.345
2011-04-01	322.251
2011-07-01	236.736
2011-10-01	265.536
2012-01-01	483.357
2012-04-01	322.993
2012-07-01	363.190
2012-10-01	360.232
2013-01-01	447.394
2013-04-01	394.377
2013-07-01	344.948
2013-10-01	360.484
2014-01-01	434.308
2014-04-01	507.770
2014-07-01	436.206
2014-10-01	341.398
2015-01-01	476.461
2015-04-01	421.826