Quarter	Billions of US Dollars
1987-01-01	2.858
1987-04-01	2.913
1987-07-01	2.809
1987-10-01	3.066
1988-01-01	2.648
1988-04-01	2.547
1988-07-01	2.594
1988-10-01	2.656
1989-01-01	2.437
1989-04-01	2.282
1989-07-01	2.314
1989-10-01	2.326
1990-01-01	2.422
1990-04-01	2.210
1990-07-01	2.108
1990-10-01	2.333
1991-01-01	2.783
1991-04-01	3.791
1991-07-01	3.932
1991-10-01	4.037
1992-01-01	4.476
1992-04-01	4.830
1992-07-01	5.288
1992-10-01	4.993
1993-01-01	5.626
1993-04-01	6.146
1993-07-01	6.435
1993-10-01	6.470
1994-01-01	6.889
1994-04-01	8.068
1994-07-01	8.714
1994-10-01	8.937
1995-01-01	11.072
1995-04-01	12.903
1995-07-01	13.626
1995-10-01	14.889
1996-01-01	15.973
1996-04-01	17.805
1996-07-01	21.908
1996-10-01	25.433
1997-01-01	26.909
1997-04-01	28.376
1997-07-01	29.940
1997-10-01	28.688
1998-01-01	27.725
1998-04-01	27.134
1998-07-01	26.764
1998-10-01	27.055
1999-01-01	25.796
1999-04-01	24.445
1999-07-01	23.669
1999-10-01	24.300
2000-01-01	25.099
2000-04-01	24.598
2000-07-01	23.405
2000-10-01	21.794
2001-01-01	20.452
2001-04-01	19.158
2001-07-01	17.166
2001-10-01	16.733
2002-01-01	14.232
2002-04-01	14.733
2002-07-01	14.840
2002-10-01	15.310
2003-01-01	16.012
2003-04-01	17.789
2003-07-01	20.681
2003-10-01	21.545
2004-01-01	25.367
2004-04-01	25.946
2004-07-01	26.718
2004-10-01	28.715
2005-01-01	30.782
2005-04-01	31.028
2005-07-01	31.662
2005-10-01	33.908
2006-01-01	34.915
2006-04-01	38.640
2006-07-01	41.082
2006-10-01	42.189
2007-01-01	43.721
2007-04-01	50.199
2007-07-01	52.532
2007-10-01	55.261
2008-01-01	59.072
2008-04-01	62.094
2008-07-01	58.934
2008-10-01	52.866
2009-01-01	54.632
2009-04-01	62.299
2009-07-01	66.015
2009-10-01	63.417
2010-01-01	65.376
2010-04-01	66.256
2010-07-01	71.381
2010-10-01	70.954
2011-01-01	74.632
2011-04-01	75.910
2011-07-01	78.630
2011-10-01	82.964
2012-01-01	88.205
2012-04-01	87.093
2012-07-01	94.460
2012-10-01	90.143
2013-01-01	91.129
2013-04-01	87.427
2013-07-01	97.034
2013-10-01	101.586
2014-01-01	103.126
2014-04-01	102.524
2014-07-01	100.601
2014-10-01	103.021
2015-01-01	100.162
2015-04-01	103.749