Quarter	Billions of US Dollars
1993-07-01	18.197
1993-10-01	19.964
1994-01-01	25.328
1994-04-01	29.352
1994-07-01	35.381
1994-10-01	36.268
1995-01-01	42.693
1995-04-01	48.948
1995-07-01	47.643
1995-10-01	49.819
1996-01-01	51.945
1996-04-01	52.068
1996-07-01	55.814
1996-10-01	58.018
1997-01-01	61.127
1997-04-01	69.565
1997-07-01	71.042
1997-10-01	67.372
1998-01-01	68.489
1998-04-01	65.433
1998-07-01	70.993
1998-10-01	83.159
1999-01-01	80.337
1999-04-01	81.097
1999-07-01	90.763
1999-10-01	95.745
2000-01-01	91.527
2000-04-01	91.632
2000-07-01	91.606
2000-10-01	84.268
2001-01-01	82.926
2001-04-01	92.150
2001-07-01	100.151
2001-10-01	96.306
2002-01-01	92.120
2002-04-01	104.557
2002-07-01	101.258
2002-10-01	101.794
2003-01-01	100.303
2003-04-01	99.145
2003-07-01	101.408
2003-10-01	104.825
2004-01-01	106.466
2004-04-01	104.115
2004-07-01	102.828
2004-10-01	107.751
2005-01-01	105.461
2005-04-01	98.524
2005-07-01	96.519
2005-10-01	89.279
2006-01-01	87.478
2006-04-01	88.602
2006-07-01	88.750
2006-10-01	89.713
2007-01-01	91.990
2007-04-01	95.882
2007-07-01	115.694
2007-10-01	123.557
2008-01-01	149.493
2008-04-01	149.037
2008-07-01	156.109
2008-10-01	175.220
2009-01-01	169.085
2009-04-01	173.851
2009-07-01	182.733
2009-10-01	176.462
2010-01-01	170.048
2010-04-01	172.071
2010-07-01	185.729
2010-10-01	190.396
2011-01-01	184.837
2011-04-01	187.099
2011-07-01	192.951
2011-10-01	186.226
2012-01-01	168.050
2012-04-01	167.389
2012-07-01	163.208
2012-10-01	143.250
2013-01-01	122.063
2013-04-01	105.927
2013-07-01	99.090
2013-10-01	89.539
2014-01-01	88.637
2014-04-01	86.384
2014-07-01	79.076
2014-10-01	69.374
2015-01-01	68.528
2015-04-01	66.504