Quarter	Billions of US Dollars
1993-07-01	19.632
1993-10-01	19.234
1994-01-01	21.934
1994-04-01	23.440
1994-07-01	24.021
1994-10-01	25.036
1995-01-01	30.379
1995-04-01	31.401
1995-07-01	29.645
1995-10-01	29.515
1996-01-01	31.246
1996-04-01	30.729
1996-07-01	30.361
1996-10-01	29.183
1997-01-01	28.095
1997-04-01	28.235
1997-07-01	28.093
1997-10-01	26.935
1998-01-01	27.073
1998-04-01	27.608
1998-07-01	30.513
1998-10-01	33.279
1999-01-01	35.574
1999-04-01	36.221
1999-07-01	35.139
1999-10-01	33.195
2000-01-01	35.587
2000-04-01	35.112
2000-07-01	32.055
2000-10-01	30.227
2001-01-01	33.015
2001-04-01	31.914
2001-07-01	33.623
2001-10-01	31.580
2002-01-01	38.044
2002-04-01	42.273
2002-07-01	41.893
2002-10-01	42.983
2003-01-01	50.637
2003-04-01	59.401
2003-07-01	59.620
2003-10-01	61.741
2004-01-01	65.076
2004-04-01	67.576
2004-07-01	68.938
2004-10-01	69.794
2005-01-01	74.893
2005-04-01	77.852
2005-07-01	75.548
2005-10-01	69.565
2006-01-01	75.851
2006-04-01	85.962
2006-07-01	83.454
2006-10-01	82.213
2007-01-01	93.891
2007-04-01	103.020
2007-07-01	116.086
2007-10-01	96.620
2008-01-01	114.465
2008-04-01	113.125
2008-07-01	102.130
2008-10-01	105.758
2009-01-01	108.525
2009-04-01	113.058
2009-07-01	112.832
2009-10-01	109.861
2010-01-01	109.593
2010-04-01	100.672
2010-07-01	106.486
2010-10-01	103.256
2011-01-01	118.977
2011-04-01	119.417
2011-07-01	110.879
2011-10-01	104.306
2012-01-01	103.584
2012-04-01	99.240
2012-07-01	102.937
2012-10-01	102.879
2013-01-01	101.885
2013-04-01	103.509
2013-07-01	117.303
2013-10-01	113.024
2014-01-01	111.041
2014-04-01	115.832
2014-07-01	103.302
2014-10-01	103.404
2015-01-01	94.332
2015-04-01	97.360