Quarter	Billions of US Dollars
1971-01-01	0
1971-04-01	0
1971-07-01	0
1971-10-01	0
1972-01-01	0
1972-04-01	0
1972-07-01	0
1972-10-01	0
1973-01-01	0
1973-04-01	0
1973-07-01	0
1973-10-01	0
1974-01-01	0
1974-04-01	0
1974-07-01	0
1974-10-01	0
1975-01-01	0
1975-04-01	0
1975-07-01	0
1975-10-01	0
1976-01-01	0
1976-04-01	0
1976-07-01	0
1976-10-01	0
1977-01-01	0
1977-04-01	0
1977-07-01	0
1977-10-01	0
1978-01-01	0
1978-04-01	0
1978-07-01	0
1978-10-01	0
1979-01-01	0
1979-04-01	0
1979-07-01	0
1979-10-01	0
1980-01-01	0
1980-04-01	0
1980-07-01	0
1980-10-01	0
1981-01-01	0
1981-04-01	0
1981-07-01	21
1981-10-01	22
1982-01-01	21
1982-04-01	20
1982-07-01	115
1982-10-01	125
1983-01-01	240
1983-04-01	238
1983-07-01	118
1983-10-01	115
1984-01-01	0
1984-04-01	17
1984-07-01	16
1984-10-01	51
1985-01-01	53
1985-04-01	38
1985-07-01	61
1985-10-01	24
1986-01-01	31
1986-04-01	60
1986-07-01	37
1986-10-01	39
1987-01-01	86
1987-04-01	62
1987-07-01	127
1987-10-01	295
1988-01-01	217
1988-04-01	199
1988-07-01	179
1988-10-01	66
1989-01-01	62
1989-04-01	51
1989-07-01	0
1989-10-01	0
1990-01-01	0
1990-04-01	0
1990-07-01	0
1990-10-01	0
1991-01-01	0
1991-04-01	0
1991-07-01	0
1991-10-01	0
1992-01-01	121
1992-04-01	130
1992-07-01	353
1992-10-01	550
1993-01-01	568
1993-04-01	546
1993-07-01	370
1993-10-01	112
1994-01-01	0
1994-04-01	3
1994-07-01	3
1994-10-01	17
1995-01-01	19
1995-04-01	33
1995-07-01	34
1995-10-01	100
1996-01-01	461
1996-04-01	446
1996-07-01	962
1996-10-01	937
1997-01-01	564
1997-04-01	550
1997-07-01	162
1997-10-01	281
1998-01-01	260
1998-04-01	334
1998-07-01	288
1998-10-01	119
1999-01-01	101
1999-04-01	95
1999-07-01	227
1999-10-01	320
2000-01-01	303
2000-04-01	251
2000-07-01	337
2000-10-01	254
2001-01-01	709
2001-04-01	572
2001-07-01	716
2001-10-01	797
2002-01-01	643
2002-04-01	451
2002-07-01	569
2002-10-01	335
2003-01-01	397
2003-04-01	1380
2003-07-01	1686
2003-10-01	1639
2004-01-01	1786
2004-04-01	1382
2004-07-01	1299
2004-10-01	1221
2005-01-01	4287
2005-04-01	7994
2005-07-01	8192
2005-10-01	9177
2006-01-01	6306
2006-04-01	1917
2006-07-01	1896
2006-10-01	1086
2007-01-01	1222
2007-04-01	1674
2007-07-01	1230
2007-10-01	2227
2008-01-01	2334
2008-04-01	1948
2008-07-01	2163
2008-10-01	2810
2009-01-01	2468
2009-04-01	3071
2009-07-01	2963
2009-10-01	507
2010-01-01	1410
2010-04-01	4814
2010-07-01	6608
2010-10-01	6498
2011-01-01	5888
2011-04-01	4704
2011-07-01	2470
2011-10-01	2322
2012-01-01	2660
2012-04-01	5839
2012-07-01	6786
2012-10-01	7662
2013-01-01	8138
2013-04-01	9647
2013-07-01	10394
2013-10-01	11898
2014-01-01	11546
2014-04-01	6248
2014-07-01	7511
2014-10-01	5946
2015-01-01	8637
2015-04-01	11590
2015-07-01	10691
2015-10-01	9977
2016-01-01	7801
2016-04-01	6076
2016-07-01	8806
2016-10-01	12316
2017-01-01	11630
2017-04-01	14624
2017-07-01	11614
2017-10-01	7532
2018-01-01	10739
2018-04-01	7121