Quarter	Billions of US Dollars
1972-01-01	0.0490
1972-04-01	0.1268
1972-07-01	0.1565
1972-10-01	0.2423
1973-01-01	0.2423
1973-04-01	0.3778
1973-07-01	0.4156
1973-10-01	0.7105
1974-01-01	0.8042
1974-04-01	1.1674
1974-07-01	1.1978
1974-10-01	1.2702
1975-01-01	1.3342
1975-04-01	1.3917
1975-07-01	1.4372
1975-10-01	1.4372
1976-01-01	1.4980
1976-04-01	1.5539
1976-07-01	1.5908
1976-10-01	1.7577
1977-01-01	1.8748
1977-04-01	1.9265
1977-07-01	1.9999
1977-10-01	2.0677
1978-01-01	2.1322
1978-04-01	2.2608
1978-07-01	2.3232
1978-10-01	2.4332
1979-01-01	2.4832
1979-04-01	2.4832
1979-07-01	2.4832
1979-10-01	2.4982
1980-01-01	2.4982
1980-04-01	2.4982
1980-07-01	2.5482
1980-10-01	2.5482
1981-01-01	2.5482
1981-04-01	2.5482
1981-07-01	2.5482
1981-10-01	2.5482
1982-01-01	2.5482
1982-04-01	2.5482
1982-07-01	2.5482
1982-10-01	2.5482
1983-01-01	2.5482
1983-04-01	2.4982
1983-07-01	2.4982
1983-10-01	2.3882
1984-01-01	2.3382
1984-04-01	2.3304
1984-07-01	2.3304
1984-10-01	2.3154
1985-01-01	2.3154
1985-04-01	2.1799
1985-07-01	2.0921
1985-10-01	1.7972
1986-01-01	1.7035
1986-04-01	1.6403
1986-07-01	1.7149
1986-10-01	1.6425
1987-01-01	1.5295
1987-04-01	1.4020
1987-07-01	1.2968
1987-10-01	1.2110
1988-01-01	1.1502
1988-04-01	1.0943
1988-07-01	1.0574
1988-10-01	0.9793
1989-01-01	0.8622
1989-04-01	0.7671
1989-07-01	0.7671
1989-10-01	0.6993
1990-01-01	0.6348
1990-04-01	0.5562
1990-07-01	0.4938
1990-10-01	0.4938
1991-01-01	0.4938
1991-04-01	1.4428
1991-07-01	1.4428
1991-10-01	1.4428
1992-01-01	1.4828
1992-04-01	1.4858
1992-07-01	1.4828
1992-10-01	1.4768
1993-01-01	1.4738
1993-04-01	1.4758
1993-07-01	1.4428
1993-10-01	1.4428
1994-01-01	1.4428
1994-04-01	1.1428
1994-07-01	1.1428
1994-10-01	1.1428
1995-01-01	1.1428
1995-04-01	1.1428
1995-07-01	1.1428
1995-10-01	1.2540
1996-01-01	1.2540
1996-04-01	1.2540
1996-07-01	1.1490
1996-10-01	1.9490
1997-01-01	1.9490
1997-04-01	2.0240
1997-07-01	2.3893
1997-10-01	2.8029
1998-01-01	2.8005
1998-04-01	2.7768
1998-07-01	3.1706
1998-10-01	3.4583
1999-01-01	3.9480
1999-04-01	4.3596
1999-07-01	4.4062
1999-10-01	5.1558
2000-01-01	5.9739
2000-04-01	6.0919
2000-07-01	6.4875
2000-10-01	6.6105
2001-01-01	6.5504
2001-04-01	7.1246
2001-07-01	7.1865
2001-10-01	7.0901
2002-01-01	7.4261
2002-04-01	7.6183
2002-07-01	7.5011
2002-10-01	7.5878
2003-01-01	7.6794
2003-04-01	8.5346
2003-07-01	8.6017
2003-10-01	9.4880
2004-01-01	10.2341
2004-04-01	11.1711
2004-07-01	11.1020
2004-10-01	12.1539
2005-01-01	11.7120
2005-04-01	11.4691
2005-07-01	11.1702
2005-10-01	11.8055
2006-01-01	13.2582
2006-04-01	12.7129
2006-07-01	12.7001
2006-10-01	13.2541
2007-01-01	13.1797
2007-04-01	13.1986
2007-07-01	12.7205
2007-10-01	12.6586
2008-01-01	13.0467
2008-04-01	14.9946
2008-07-01	14.8078
2008-10-01	14.7362
2009-01-01	15.6139
2009-04-01	15.7010
2009-07-01	15.7446
2009-10-01	15.1246
2010-01-01	16.5661
2010-04-01	16.9959
2010-07-01	17.1504
2010-10-01	17.1956
2011-01-01	17.2461
2011-04-01	16.7077
2011-07-01	16.4819
2011-10-01	21.3470
2012-01-01	23.5255
2012-04-01	23.1519
2012-07-01	23.2377
2012-10-01	27.0911
2013-01-01	27.9935
2013-04-01	25.6255
2013-07-01	26.0352
2013-10-01	24.0004
2014-01-01	25.5707
2014-04-01	27.1194
2014-07-01	26.6815
2014-10-01	29.7889
2015-01-01	29.3707
2015-04-01	29.5397