Quarter	Billions of US Dollars
1987-01-01	8.989
1987-04-01	10.079
1987-07-01	11.303
1987-10-01	12.833
1988-01-01	12.125
1988-04-01	14.128
1988-07-01	14.822
1988-10-01	16.741
1989-01-01	18.643
1989-04-01	18.104
1989-07-01	20.540
1989-10-01	21.645
1990-01-01	23.092
1990-04-01	21.803
1990-07-01	22.541
1990-10-01	22.411
1991-01-01	23.207
1991-04-01	22.018
1991-07-01	22.895
1991-10-01	23.819
1992-01-01	22.787
1992-04-01	23.111
1992-07-01	23.662
1992-10-01	22.178
1993-01-01	22.343
1993-04-01	22.344
1993-07-01	20.512
1993-10-01	20.345
1994-01-01	21.636
1994-04-01	23.145
1994-07-01	22.660
1994-10-01	22.795
1995-01-01	23.540
1995-04-01	23.357
1995-07-01	24.492
1995-10-01	25.966
1996-01-01	28.606
1996-04-01	31.305
1996-07-01	33.028
1996-10-01	35.122
1997-01-01	36.018
1997-04-01	38.018
1997-07-01	37.236
1997-10-01	34.065
1998-01-01	36.660
1998-04-01	34.343
1998-07-01	36.281
1998-10-01	35.925
1999-01-01	39.222
1999-04-01	38.851
1999-07-01	42.697
1999-10-01	45.172
2000-01-01	49.169
2000-04-01	52.881
2000-07-01	53.174
2000-10-01	56.994
2001-01-01	53.099
2001-04-01	54.730
2001-07-01	56.887
2001-10-01	55.455
2002-01-01	55.920
2002-04-01	59.557
2002-07-01	62.575
2002-10-01	65.858
2003-01-01	69.277
2003-04-01	80.505
2003-07-01	87.689
2003-10-01	98.614
2004-01-01	105.954
2004-04-01	110.081
2004-07-01	124.049
2004-10-01	135.720
2005-01-01	139.286
2005-04-01	149.779
2005-07-01	146.040
2005-10-01	155.064
2006-01-01	175.756
2006-04-01	191.026
2006-07-01	198.872
2006-10-01	215.758
2007-01-01	216.971
2007-04-01	229.077
2007-07-01	244.811
2007-10-01	245.968
2008-01-01	297.120
2008-04-01	294.903
2008-07-01	269.958
2008-10-01	243.812
2009-01-01	229.680
2009-04-01	253.598
2009-07-01	268.756
2009-10-01	300.193
2010-01-01	305.291
2010-04-01	298.879
2010-07-01	317.864
2010-10-01	325.373
2011-01-01	326.391
2011-04-01	335.211
2011-07-01	322.046
2011-10-01	308.544
2012-01-01	319.384
2012-04-01	315.906
2012-07-01	343.470
2012-10-01	332.220
2013-01-01	331.831
2013-04-01	327.032
2013-07-01	337.128
2013-10-01	354.216
2014-01-01	358.387
2014-04-01	366.541
2014-07-01	350.788
2014-10-01	345.412
2015-01-01	336.101
2015-04-01	342.225