Quarter	Billions of US Dollars
1968-07-01	0.040
1968-10-01	0.040
1969-01-01	0.040
1969-04-01	0.040
1969-07-01	0.040
1969-10-01	0.040
1970-01-01	0.040
1970-04-01	0.040
1970-07-01	0.040
1970-10-01	0.040
1971-01-01	0.040
1971-04-01	0.040
1971-07-01	0.040
1971-10-01	0.040
1972-01-01	0.040
1972-04-01	0.065
1972-07-01	0.065
1972-10-01	0.115
1973-01-01	0.148
1973-04-01	0.193
1973-07-01	0.194
1973-10-01	0.206
1974-01-01	0.278
1974-04-01	0.294
1974-07-01	0.291
1974-10-01	0.319
1975-01-01	0.368
1975-04-01	0.367
1975-07-01	0.354
1975-10-01	0.374
1976-01-01	0.378
1976-04-01	0.391
1976-07-01	0.794
1976-10-01	0.849
1977-01-01	0.935
1977-04-01	0.976
1977-07-01	1.069
1977-10-01	1.145
1978-01-01	1.352
1978-04-01	1.517
1978-07-01	1.707
1978-10-01	1.843
1979-01-01	2.067
1979-04-01	2.163
1979-07-01	2.400
1979-10-01	2.364
1980-01-01	2.265
1980-04-01	2.460
1980-07-01	2.601
1980-10-01	2.634
1981-01-01	2.558
1981-04-01	2.510
1981-07-01	2.618
1981-10-01	2.847
1982-01-01	3.142
1982-04-01	3.379
1982-07-01	3.342
1982-10-01	4.010
1983-01-01	4.025
1983-04-01	4.244
1983-07-01	5.583
1983-10-01	5.764
1984-01-01	6.258
1984-04-01	6.158
1984-07-01	6.427
1984-10-01	7.429
1985-01-01	8.167
1985-04-01	9.761
1985-07-01	10.990
1985-10-01	13.407
1986-01-01	15.280
1986-04-01	16.406
1986-07-01	17.183
1986-10-01	17.325
1987-01-01	18.745
1987-04-01	18.883
1987-07-01	19.456
1987-10-01	21.854
1988-01-01	21.507
1988-04-01	20.590
1988-07-01	21.146
1988-10-01	22.330
1989-01-01	21.521
1989-04-01	20.648
1989-07-01	20.979
1989-10-01	21.816
1990-01-01	21.396
1990-04-01	22.061
1990-07-01	23.766
1990-10-01	24.399
1991-01-01	24.205
1991-04-01	25.863
1991-07-01	27.361
1991-10-01	29.117
1992-01-01	28.303
1992-04-01	29.703
1992-07-01	32.292
1992-10-01	34.357
1993-01-01	35.487
1993-04-01	37.648
1993-07-01	42.917
1993-10-01	47.518
1994-01-01	53.194
1994-04-01	58.109
1994-07-01	63.134
1994-10-01	64.780
1995-01-01	68.314
1995-04-01	70.679
1995-07-01	73.150
1995-10-01	74.537
1996-01-01	79.443
1996-04-01	85.656
1996-07-01	95.400
1996-10-01	107.659
1997-01-01	114.441
1997-04-01	128.589
1997-07-01	138.650
1997-10-01	142.188
1998-01-01	141.815
1998-04-01	146.407
1998-07-01	144.794
1998-10-01	146.941
1999-01-01	145.517
1999-04-01	145.642
1999-07-01	144.968
1999-10-01	144.569
2000-01-01	146.455
2000-04-01	143.928
2000-07-01	141.256
2000-10-01	140.962
2001-01-01	136.929
2001-04-01	137.924
2001-07-01	136.289
2001-10-01	136.360
2002-01-01	139.518
2002-04-01	147.609
2002-07-01	150.303
2002-10-01	154.632
2003-01-01	155.975
2003-04-01	161.753
2003-07-01	169.383
2003-10-01	177.389
2004-01-01	186.161
2004-04-01	192.513
2004-07-01	199.087
2004-10-01	211.472
2005-01-01	219.208
2005-04-01	224.308
2005-07-01	230.069
2005-10-01	239.278
2006-01-01	251.392
2006-04-01	260.762
2006-07-01	270.846
2006-10-01	284.012
2007-01-01	299.685
2007-04-01	320.170
2007-07-01	322.716
2007-10-01	330.054
2008-01-01	337.894
2008-04-01	341.715
2008-07-01	343.410
2008-10-01	337.428
2009-01-01	336.235
2009-04-01	345.991
2009-07-01	362.366
2009-10-01	366.761
2010-01-01	373.226
2010-04-01	378.737
2010-07-01	399.056
2010-10-01	427.428
2011-01-01	449.071
2011-04-01	482.651
2011-07-01	490.681
2011-10-01	496.286
2012-01-01	519.230
2012-04-01	548.129
2012-07-01	572.248
2012-10-01	589.390
2013-01-01	612.655
2013-04-01	651.604
2013-07-01	675.411
2013-10-01	716.246
2014-01-01	747.907
2014-04-01	801.444
2014-07-01	827.075
2014-10-01	893.521
2015-01-01	918.516
2015-04-01	976.905