Quarter	Billions of US Dollars
1993-07-01	9.249
1993-10-01	10.202
1994-01-01	11.664
1994-04-01	12.916
1994-07-01	14.465
1994-10-01	14.332
1995-01-01	16.915
1995-04-01	18.458
1995-07-01	19.298
1995-10-01	22.896
1996-01-01	26.391
1996-04-01	28.571
1996-07-01	23.257
1996-10-01	29.484
1997-01-01	28.695
1997-04-01	27.036
1997-07-01	30.004
1997-10-01	35.932
1998-01-01	36.943
1998-04-01	38.788
1998-07-01	39.731
1998-10-01	40.057
1999-01-01	40.381
1999-04-01	45.100
1999-07-01	53.583
1999-10-01	54.880
2000-01-01	63.421
2000-04-01	65.546
2000-07-01	61.612
2000-10-01	69.430
2001-01-01	72.544
2001-04-01	66.581
2001-07-01	73.812
2001-10-01	73.517
2002-01-01	74.398
2002-04-01	80.660
2002-07-01	85.077
2002-10-01	97.686
2003-01-01	100.642
2003-04-01	105.370
2003-07-01	101.512
2003-10-01	104.648
2004-01-01	103.498
2004-04-01	102.549
2004-07-01	108.009
2004-10-01	112.650
2005-01-01	116.069
2005-04-01	107.698
2005-07-01	106.404
2005-10-01	102.553
2006-01-01	114.759
2006-04-01	117.326
2006-07-01	119.508
2006-10-01	121.104
2007-01-01	134.368
2007-04-01	145.423
2007-07-01	135.151
2007-10-01	139.396
2008-01-01	127.994
2008-04-01	119.628
2008-07-01	103.257
2008-10-01	99.532
2009-01-01	83.963
2009-04-01	89.680
2009-07-01	92.484
2009-10-01	80.820
2010-01-01	88.903
2010-04-01	88.402
2010-07-01	91.191
2010-10-01	89.059
2011-01-01	77.959
2011-04-01	72.359
2011-07-01	68.854
2011-10-01	70.579
2012-01-01	69.949
2012-04-01	75.449
2012-07-01	87.121
2012-10-01	88.780
2013-01-01	90.064
2013-04-01	86.669
2013-07-01	78.813
2013-10-01	79.671
2014-01-01	81.662
2014-04-01	85.446
2014-07-01	87.713
2014-10-01	86.515
2015-01-01	79.552
2015-04-01	76.801