Quarter	Billions of US Dollars
1987-01-01	32.661
1987-04-01	33.945
1987-07-01	34.700
1987-10-01	37.122
1988-01-01	38.122
1988-04-01	37.884
1988-07-01	39.301
1988-10-01	41.501
1989-01-01	42.715
1989-04-01	43.515
1989-07-01	44.786
1989-10-01	46.139
1990-01-01	47.360
1990-04-01	47.473
1990-07-01	53.229
1990-10-01	54.047
1991-01-01	54.483
1991-04-01	54.401
1991-07-01	56.145
1991-10-01	57.957
1992-01-01	54.938
1992-04-01	56.205
1992-07-01	59.828
1992-10-01	55.826
1993-01-01	52.864
1993-04-01	50.233
1993-07-01	58.521
1993-10-01	59.725
1994-01-01	64.540
1994-04-01	69.603
1994-07-01	76.158
1994-10-01	82.068
1995-01-01	91.375
1995-04-01	98.657
1995-07-01	102.839
1995-10-01	109.798
1996-01-01	113.944
1996-04-01	120.220
1996-07-01	124.914
1996-10-01	129.928
1997-01-01	137.280
1997-04-01	143.106
1997-07-01	150.468
1997-10-01	151.684
1998-01-01	158.394
1998-04-01	160.719
1998-07-01	168.290
1998-10-01	173.807
1999-01-01	172.924
1999-04-01	179.994
1999-07-01	192.654
1999-10-01	195.315
2000-01-01	201.761
2000-04-01	202.945
2000-07-01	201.418
2000-10-01	208.853
2001-01-01	214.255
2001-04-01	214.358
2001-07-01	223.902
2001-10-01	216.320
2002-01-01	215.164
2002-04-01	248.110
2002-07-01	241.516
2002-10-01	242.457
2003-01-01	252.597
2003-04-01	260.703
2003-07-01	261.626
2003-10-01	272.657
2004-01-01	265.099
2004-04-01	259.737
2004-07-01	264.710
2004-10-01	283.081
2005-01-01	283.202
2005-04-01	267.797
2005-07-01	267.928
2005-10-01	263.672
2006-01-01	272.840
2006-04-01	285.351
2006-07-01	291.191
2006-10-01	305.351
2007-01-01	307.175
2007-04-01	323.321
2007-07-01	330.069
2007-10-01	335.397
2008-01-01	341.766
2008-04-01	329.451
2008-07-01	302.850
2008-10-01	285.954
2009-01-01	271.176
2009-04-01	275.319
2009-07-01	277.113
2009-10-01	265.706
2010-01-01	256.582
2010-04-01	241.948
2010-07-01	259.020
2010-10-01	258.746
2011-01-01	263.043
2011-04-01	275.692
2011-07-01	267.501
2011-10-01	262.944
2012-01-01	285.995
2012-04-01	279.884
2012-07-01	294.693
2012-10-01	297.680
2013-01-01	304.471
2013-04-01	314.772
2013-07-01	322.004
2013-10-01	326.951
2014-01-01	331.698
2014-04-01	342.682
2014-07-01	342.597
2014-10-01	328.022
2015-01-01	317.730
2015-04-01	319.718