Quarter	Billions of US Dollars
1987-01-01	12.030
1987-04-01	12.385
1987-07-01	12.713
1987-10-01	13.490
1988-01-01	13.332
1988-04-01	13.765
1988-07-01	14.235
1988-10-01	15.113
1989-01-01	14.584
1989-04-01	15.118
1989-07-01	16.840
1989-10-01	17.573
1990-01-01	19.225
1990-04-01	19.077
1990-07-01	20.309
1990-10-01	20.599
1991-01-01	21.026
1991-04-01	20.293
1991-07-01	22.178
1991-10-01	24.838
1992-01-01	25.413
1992-04-01	27.702
1992-07-01	30.600
1992-10-01	30.358
1993-01-01	32.228
1993-04-01	35.146
1993-07-01	28.486
1993-10-01	31.242
1994-01-01	36.143
1994-04-01	38.333
1994-07-01	43.644
1994-10-01	49.322
1995-01-01	57.710
1995-04-01	61.016
1995-07-01	62.716
1995-10-01	64.675
1996-01-01	68.222
1996-04-01	71.571
1996-07-01	74.192
1996-10-01	76.359
1997-01-01	74.805
1997-04-01	75.490
1997-07-01	78.880
1997-10-01	80.057
1998-01-01	81.385
1998-04-01	84.685
1998-07-01	95.848
1998-10-01	103.479
1999-01-01	105.901
1999-04-01	113.004
1999-07-01	126.052
1999-10-01	123.369
2000-01-01	129.080
2000-04-01	138.607
2000-07-01	132.369
2000-10-01	141.202
2001-01-01	141.159
2001-04-01	140.311
2001-07-01	150.107
2001-10-01	150.208
2002-01-01	157.780
2002-04-01	179.109
2002-07-01	185.323
2002-10-01	201.808
2003-01-01	222.750
2003-04-01	243.307
2003-07-01	257.351
2003-10-01	286.546
2004-01-01	293.172
2004-04-01	301.895
2004-07-01	314.665
2004-10-01	351.598
2005-01-01	355.253
2005-04-01	350.870
2005-07-01	357.284
2005-10-01	360.932
2006-01-01	387.934
2006-04-01	425.753
2006-07-01	433.608
2006-10-01	462.462
2007-01-01	498.072
2007-04-01	523.221
2007-07-01	559.430
2007-10-01	583.725
2008-01-01	625.916
2008-04-01	645.636
2008-07-01	588.256
2008-10-01	569.682
2009-01-01	566.566
2009-04-01	647.751
2009-07-01	676.465
2009-10-01	677.832
2010-01-01	687.029
2010-04-01	631.699
2010-07-01	723.603
2010-10-01	729.560
2011-01-01	782.641
2011-04-01	813.456
2011-07-01	772.862
2011-10-01	751.646
2012-01-01	784.262
2012-04-01	749.054
2012-07-01	779.064
2012-10-01	770.487
2013-01-01	740.413
2013-04-01	750.495
2013-07-01	777.270
2013-10-01	799.595
2014-01-01	765.809
2014-04-01	756.630
2014-07-01	710.986
2014-10-01	676.120
2015-01-01	634.860
2015-04-01	646.312