Quarter	Billions of US Dollars
1993-07-01	23.690
1993-10-01	22.415
1994-01-01	22.512
1994-04-01	20.986
1994-07-01	19.758
1994-10-01	18.531
1995-01-01	19.588
1995-04-01	23.601
1995-07-01	25.539
1995-10-01	25.553
1996-01-01	29.337
1996-04-01	29.562
1996-07-01	18.637
1996-10-01	32.660
1997-01-01	33.433
1997-04-01	33.770
1997-07-01	36.821
1997-10-01	32.692
1998-01-01	36.017
1998-04-01	32.009
1998-07-01	36.555
1998-10-01	33.915
1999-01-01	37.420
1999-04-01	33.097
1999-07-01	37.826
1999-10-01	41.228
2000-01-01	42.058
2000-04-01	38.641
2000-07-01	39.181
2000-10-01	42.948
2001-01-01	43.724
2001-04-01	43.342
2001-07-01	44.324
2001-10-01	45.077
2002-01-01	49.074
2002-04-01	56.478
2002-07-01	56.149
2002-10-01	56.717
2003-01-01	54.433
2003-04-01	58.196
2003-07-01	59.297
2003-10-01	72.563
2004-01-01	76.362
2004-04-01	70.232
2004-07-01	76.698
2004-10-01	80.929
2005-01-01	78.003
2005-04-01	81.132
2005-07-01	82.642
2005-10-01	87.162
2006-01-01	98.020
2006-04-01	111.996
2006-07-01	114.056
2006-10-01	120.367
2007-01-01	113.193
2007-04-01	126.443
2007-07-01	127.856
2007-10-01	117.473
2008-01-01	164.256
2008-04-01	158.599
2008-07-01	137.130
2008-10-01	102.488
2009-01-01	82.364
2009-04-01	97.631
2009-07-01	95.251
2009-10-01	99.229
2010-01-01	104.539
2010-04-01	110.811
2010-07-01	118.321
2010-10-01	113.086
2011-01-01	108.335
2011-04-01	108.275
2011-07-01	97.107
2011-10-01	99.343
2012-01-01	96.366
2012-04-01	98.097
2012-07-01	96.072
2012-10-01	95.036
2013-01-01	108.314
2013-04-01	108.538
2013-07-01	124.911
2013-10-01	120.627
2014-01-01	122.006
2014-04-01	128.273
2014-07-01	118.584
2014-10-01	107.224
2015-01-01	94.036
2015-04-01	92.002