Quarter	Billions of US Dollars
1971-01-01	0.0300
1972-04-01	0.0350
1974-04-01	0.0239
1974-07-01	0.0516
1974-10-01	0.0081
1975-01-01	0.0454
1975-04-01	0.2048
1975-07-01	0.0191
1976-01-01	0.1080
1976-07-01	0.1000
1976-10-01	0.0968
1977-04-01	0.1200
1977-07-01	0.1062
1978-01-01	0.0527
1978-07-01	0.0240
1978-10-01	0.0840
1979-01-01	0.1000
1979-07-01	0.1295
1980-04-01	0.1296
1981-07-01	0.0233
1981-10-01	0.0283
1982-04-01	0.1300
1982-10-01	0.7000
1983-01-01	0.2000
1983-04-01	0.5126
1983-07-01	0.0520
1983-10-01	0.1606
1984-01-01	0.0507
1984-04-01	0.1000
1984-07-01	0.3150
1984-10-01	0.3759
1985-01-01	0.1178
1985-04-01	0.1995
1985-07-01	0.2453
1985-10-01	0.4672
1986-01-01	0.6939
1986-04-01	0.5907
1986-07-01	0.4870
1986-10-01	0.5995
1987-01-01	0.5497
1987-04-01	0.4372
1987-07-01	0.2071
1987-10-01	0.2062
1988-01-01	0.0507
1988-04-01	0.5377
1988-07-01	0.1175
1988-10-01	0.9161
1989-01-01	0.2400
1989-07-01	0.4862
1989-10-01	0.1739
1990-01-01	0.7132
1990-04-01	0.2257
1990-07-01	0.4245
1990-10-01	0.7061
1991-01-01	1.0004
1991-04-01	2.0947
1991-07-01	1.0422
1991-10-01	0.8760
1992-01-01	0.9207
1992-04-01	0.6508
1992-07-01	0.5849
1992-10-01	1.3220
1993-01-01	2.1313
1993-04-01	1.0307
1993-07-01	2.1304
1993-10-01	1.2862
1994-01-01	1.7110
1994-04-01	1.5323
1994-07-01	1.3081
1994-10-01	2.6441
1995-01-01	1.5033
1995-04-01	2.5412
1995-07-01	3.3296
1995-10-01	1.0237
1996-01-01	5.1614
1996-04-01	3.6407
1996-07-01	1.2461
1996-10-01	4.2752
1997-01-01	3.3453
1997-04-01	5.3597
1997-07-01	7.2323
1997-10-01	8.0778
1998-01-01	5.6140
1998-04-01	8.8213
1998-07-01	5.1560
1998-10-01	3.6326
1999-01-01	4.5705
1999-04-01	5.7871
1999-07-01	4.8169
1999-10-01	2.6045
2000-01-01	6.3439
2000-04-01	7.8189
2000-07-01	11.3974
2000-10-01	7.6837
2001-01-01	6.2122
2001-04-01	7.4008
2001-07-01	6.9711
2001-10-01	8.4426
2002-01-01	5.1931
2002-04-01	11.2028
2002-07-01	4.4297
2002-10-01	7.3205
2003-01-01	5.7269
2003-04-01	6.2402
2003-07-01	14.2353
2003-10-01	16.0232
2004-01-01	35.4870
2004-04-01	13.4260
2004-07-01	27.6619
2004-10-01	29.6551
2005-01-01	15.1598
2005-04-01	15.6728
2005-07-01	39.2882
2005-10-01	17.4453
2006-01-01	23.8151
2006-04-01	21.8903
2006-07-01	25.8935
2006-10-01	17.6846
2007-01-01	31.8749
2007-04-01	32.9623
2007-07-01	20.2958
2007-10-01	17.3974
2008-01-01	16.2630
2008-04-01	42.2612
2008-07-01	21.8894
2008-10-01	10.7837
2009-01-01	34.9845
2009-04-01	22.9979
2009-07-01	17.3323
2009-10-01	13.1874
2010-01-01	21.8502
2010-04-01	10.3403
2010-07-01	21.0040
2010-10-01	7.6614
2011-01-01	9.9805
2011-04-01	12.5365
2011-07-01	9.7530
2011-10-01	11.6305
2012-01-01	28.2786
2012-04-01	14.5035
2012-07-01	14.7855
2012-10-01	17.3848
2013-01-01	9.6048
2013-04-01	6.6493
2013-07-01	12.2356
2013-10-01	13.3346
2014-01-01	14.8437
2014-04-01	32.8566
2014-07-01	27.3377
2014-10-01	17.5408
2015-01-01	26.0189
2015-04-01	33.6519