Quarter	Billions of US Dollars
1971-01-01	0.0250
1972-10-01	0.0527
1973-01-01	0.0295
1973-04-01	0.0200
1973-07-01	0.0719
1974-01-01	0.0234
1974-04-01	0.0587
1974-07-01	0.0157
1974-10-01	0.0364
1975-04-01	0.0344
1975-10-01	0.0384
1976-07-01	0.0202
1977-01-01	0.0300
1977-07-01	0.0566
1978-04-01	0.0833
1979-04-01	0.0393
1979-07-01	0.0307
1979-10-01	0.1100
1980-01-01	0.1163
1980-07-01	0.0606
1980-10-01	0.1473
1981-01-01	0.1000
1981-04-01	0.1000
1981-10-01	0.3420
1982-01-01	0.3000
1982-04-01	0.1284
1982-07-01	0.1645
1982-10-01	0.1426
1983-01-01	0.1824
1983-04-01	0.1047
1983-07-01	0.0569
1983-10-01	0.6496
1984-01-01	0.1367
1984-04-01	0.0908
1984-07-01	0.3490
1984-10-01	0.2579
1985-01-01	0.5094
1985-04-01	0.3518
1985-07-01	0.3383
1985-10-01	0.2848
1986-01-01	0.3879
1986-04-01	0.6097
1986-07-01	0.9278
1986-10-01	0.2703
1987-01-01	0.1133
1987-04-01	0.2678
1987-07-01	0.0266
1987-10-01	0.2965
1988-01-01	0.4919
1988-04-01	0.1205
1988-07-01	0.0632
1989-01-01	0.3768
1989-04-01	0.2616
1989-07-01	1.7723
1989-10-01	0.1257
1990-01-01	0.6405
1990-04-01	0.1036
1990-07-01	0.1465
1991-01-01	0.1588
1991-04-01	0.5742
1991-07-01	0.0747
1991-10-01	0.2000
1992-01-01	0.5720
1992-07-01	0.5009
1992-10-01	1.5010
1993-01-01	1.4107
1993-04-01	0.1855
1993-07-01	0.1502
1993-10-01	0.2686
1994-01-01	0.0057
1994-04-01	0.4430
1994-07-01	0.0162
1994-10-01	0.4900
1995-01-01	0.7905
1995-04-01	0.5183
1995-07-01	0.2723
1995-10-01	1.2405
1996-01-01	4.2703
1996-04-01	1.9037
1996-07-01	1.9437
1996-10-01	0.7574
1997-01-01	1.5132
1997-04-01	0.1228
1997-07-01	0.5976
1997-10-01	0.6801
1998-01-01	2.7578
1998-04-01	1.6162
1998-07-01	0.0902
1998-10-01	0.3566
1999-01-01	0.7950
1999-04-01	1.1296
1999-07-01	1.4343
1999-10-01	1.5409
2000-01-01	2.0770
2000-04-01	2.2901
2000-07-01	1.6704
2000-10-01	0.2418
2001-01-01	5.3120
2001-04-01	2.3786
2001-07-01	0.2033
2001-10-01	1.4211
2002-01-01	0.5724
2002-04-01	0.9066
2002-07-01	2.5855
2002-10-01	3.8000
2003-01-01	4.4333
2003-04-01	5.3784
2003-07-01	7.3967
2003-10-01	6.2029
2004-01-01	6.8369
2004-04-01	5.6206
2004-07-01	8.3761
2004-10-01	8.9867
2005-01-01	7.5789
2005-04-01	15.6016
2005-07-01	11.3184
2005-10-01	16.7256
2006-01-01	10.9735
2006-04-01	20.6213
2006-07-01	20.7496
2006-10-01	22.5139
2007-01-01	39.6285
2007-04-01	40.7026
2007-07-01	40.5529
2007-10-01	33.3228
2008-01-01	20.6390
2008-04-01	41.9212
2008-07-01	14.3506
2008-10-01	44.8119
2009-01-01	23.3206
2009-04-01	39.3246
2009-07-01	37.2528
2009-10-01	17.2254
2010-01-01	36.2058
2010-04-01	7.0242
2010-07-01	10.5432
2010-10-01	14.1078
2011-01-01	7.7162
2011-04-01	2.4049
2011-07-01	1.9618
2011-10-01	4.8932
2012-01-01	6.5817
2012-04-01	9.0777
2012-07-01	5.5778
2012-10-01	16.7587
2013-01-01	15.4246
2013-04-01	4.7138
2013-07-01	10.3487
2013-10-01	12.1924
2014-01-01	11.7834
2014-04-01	9.4951
2014-07-01	8.8246
2014-10-01	2.1949
2015-01-01	4.8311
2015-04-01	20.7305