Quarter	Billions of US Dollars
1987-01-01	4.781
1987-04-01	5.098
1987-07-01	6.449
1987-10-01	7.211
1988-01-01	8.359
1988-04-01	9.129
1988-07-01	9.948
1988-10-01	11.300
1989-01-01	11.790
1989-04-01	12.718
1989-07-01	14.272
1989-10-01	16.797
1990-01-01	18.429
1990-04-01	20.022
1990-07-01	23.168
1990-10-01	26.177
1991-01-01	26.353
1991-04-01	27.155
1991-07-01	28.397
1991-10-01	29.760
1992-01-01	29.483
1992-04-01	31.527
1992-07-01	33.951
1992-10-01	32.214
1993-01-01	31.889
1993-04-01	32.016
1993-07-01	51.269
1993-10-01	50.457
1994-01-01	51.454
1994-04-01	57.234
1994-07-01	62.001
1994-10-01	63.381
1995-01-01	68.764
1995-04-01	74.726
1995-07-01	70.056
1995-10-01	72.524
1996-01-01	75.399
1996-04-01	78.081
1996-07-01	82.985
1996-10-01	86.808
1997-01-01	86.910
1997-04-01	94.832
1997-07-01	101.115
1997-10-01	95.982
1998-01-01	97.891
1998-04-01	99.021
1998-07-01	101.540
1998-10-01	111.784
1999-01-01	110.326
1999-04-01	111.928
1999-07-01	128.976
1999-10-01	131.351
2000-01-01	125.006
2000-04-01	127.094
2000-07-01	120.314
2000-10-01	115.583
2001-01-01	110.185
2001-04-01	111.344
2001-07-01	113.860
2001-10-01	106.758
2002-01-01	103.430
2002-04-01	110.384
2002-07-01	110.464
2002-10-01	114.041
2003-01-01	115.593
2003-04-01	114.064
2003-07-01	119.539
2003-10-01	127.037
2004-01-01	133.163
2004-04-01	133.071
2004-07-01	129.256
2004-10-01	133.528
2005-01-01	133.417
2005-04-01	127.889
2005-07-01	126.081
2005-10-01	118.736
2006-01-01	124.774
2006-04-01	133.244
2006-07-01	133.658
2006-10-01	141.071
2007-01-01	149.942
2007-04-01	152.165
2007-07-01	159.574
2007-10-01	168.221
2008-01-01	180.670
2008-04-01	181.735
2008-07-01	179.384
2008-10-01	188.237
2009-01-01	182.287
2009-04-01	186.146
2009-07-01	194.316
2009-10-01	189.783
2010-01-01	181.753
2010-04-01	174.264
2010-07-01	184.855
2010-10-01	184.413
2011-01-01	182.974
2011-04-01	179.336
2011-07-01	178.689
2011-10-01	174.011
2012-01-01	166.605
2012-04-01	165.642
2012-07-01	172.886
2012-10-01	161.971
2013-01-01	159.121
2013-04-01	154.689
2013-07-01	156.500
2013-10-01	157.219
2014-01-01	162.092
2014-04-01	157.938
2014-07-01	154.845
2014-10-01	155.971
2015-01-01	154.706
2015-04-01	153.969