Quarter	Billions of US Dollars
1989-07-01	2.849
1989-10-01	2.516
1990-01-01	3.737
1990-04-01	3.190
1990-07-01	4.947
1990-10-01	9.658
1991-01-01	12.184
1991-04-01	13.502
1991-07-01	14.572
1991-10-01	16.862
1992-01-01	18.256
1992-04-01	21.916
1992-07-01	25.557
1992-10-01	25.132
1993-01-01	17.191
1993-04-01	17.347
1993-07-01	28.562
1993-10-01	30.514
1994-01-01	34.443
1994-04-01	34.945
1994-07-01	35.128
1994-10-01	34.614
1995-01-01	33.673
1995-04-01	36.326
1995-07-01	42.228
1995-10-01	48.578
1996-01-01	49.659
1996-04-01	55.039
1996-07-01	56.869
1996-10-01	63.665
1997-01-01	62.858
1997-04-01	70.449
1997-07-01	75.267
1997-10-01	76.721
1998-01-01	78.438
1998-04-01	72.440
1998-07-01	79.688
1998-10-01	85.727
1999-01-01	92.313
1999-04-01	102.050
1999-07-01	128.334
1999-10-01	144.039
2000-01-01	161.823
2000-04-01	185.806
2000-07-01	179.837
2000-10-01	201.520
2001-01-01	180.552
2001-04-01	149.763
2001-07-01	139.086
2001-10-01	127.440
2002-01-01	117.269
2002-04-01	134.709
2002-07-01	134.846
2002-10-01	131.804
2003-01-01	139.868
2003-04-01	133.926
2003-07-01	131.064
2003-10-01	133.654
2004-01-01	160.134
2004-04-01	164.864
2004-07-01	157.808
2004-10-01	165.836
2005-01-01	166.817
2005-04-01	161.121
2005-07-01	180.239
2005-10-01	167.075
2006-01-01	180.165
2006-04-01	191.714
2006-07-01	191.929
2006-10-01	211.430
2007-01-01	227.998
2007-04-01	262.917
2007-07-01	324.241
2007-10-01	390.110
2008-01-01	458.955
2008-04-01	501.931
2008-07-01	434.923
2008-10-01	344.358
2009-01-01	320.258
2009-04-01	288.277
2009-07-01	301.418
2009-10-01	260.986
2010-01-01	284.346
2010-04-01	266.690
2010-07-01	314.008
2010-10-01	295.014
2011-01-01	312.939
2011-04-01	307.795
2011-07-01	280.466
2011-10-01	260.193
2012-01-01	347.338
2012-04-01	341.591
2012-07-01	328.531
2012-10-01	332.573
2013-01-01	321.564
2013-04-01	339.960
2013-07-01	346.460
2013-10-01	377.632
2014-01-01	350.276
2014-04-01	370.112
2014-07-01	370.983
2014-10-01	358.603
2015-01-01	354.457
2015-04-01	371.895