Quarter	Billions of US Dollars
1966-01-01	0.0200
1967-10-01	0.0150
1971-01-01	0.0150
1971-07-01	0.0150
1972-01-01	0.1197
1972-04-01	0.0300
1972-07-01	0.0250
1972-10-01	0.0811
1973-01-01	0.0662
1973-04-01	0.0388
1973-10-01	0.0458
1974-01-01	0.0220
1974-04-01	0.0500
1974-10-01	0.0728
1975-01-01	0.3465
1975-04-01	0.3078
1975-07-01	0.0974
1975-10-01	0.2857
1976-01-01	0.2753
1976-04-01	0.1625
1976-07-01	0.2690
1976-10-01	0.3865
1977-01-01	0.3406
1977-04-01	0.4041
1977-07-01	0.3507
1977-10-01	0.4384
1978-01-01	0.0809
1978-04-01	0.4397
1978-07-01	0.0359
1978-10-01	0.1558
1979-01-01	0.2558
1979-04-01	0.8014
1979-07-01	0.0548
1979-10-01	0.4363
1980-01-01	0.6392
1980-04-01	1.0250
1980-07-01	0.6964
1980-10-01	0.8217
1981-01-01	0.7084
1981-04-01	0.2772
1981-07-01	0.1639
1981-10-01	0.5698
1982-01-01	1.2992
1982-04-01	0.3671
1982-07-01	0.3782
1982-10-01	0.6349
1983-01-01	2.0974
1983-04-01	0.2808
1983-07-01	0.2681
1983-10-01	1.2167
1984-01-01	1.5218
1984-04-01	2.6412
1984-07-01	0.3510
1984-10-01	2.4654
1985-01-01	1.7635
1985-04-01	2.8433
1985-07-01	0.4565
1985-10-01	1.6514
1986-01-01	2.3951
1986-04-01	1.4821
1986-07-01	2.1536
1986-10-01	1.5716
1987-01-01	2.5113
1987-04-01	1.4384
1987-07-01	0.8314
1987-10-01	0.5513
1988-01-01	3.0071
1988-04-01	2.9355
1988-07-01	1.3449
1988-10-01	2.9170
1989-01-01	3.5388
1989-04-01	1.8984
1989-07-01	1.2961
1989-10-01	3.8665
1990-01-01	2.6515
1990-04-01	2.7037
1990-07-01	1.7466
1990-10-01	1.5148
1991-01-01	2.9899
1991-04-01	2.5272
1991-07-01	1.5373
1991-10-01	1.6656
1992-01-01	1.7263
1992-04-01	5.3698
1992-07-01	0.7440
1992-10-01	2.0844
1993-01-01	6.3413
1993-04-01	2.1756
1993-07-01	4.6998
1993-10-01	6.1033
1994-01-01	8.6220
1994-04-01	8.9505
1994-07-01	7.3885
1994-10-01	4.0425
1995-01-01	4.5401
1995-04-01	5.4849
1995-07-01	5.8485
1995-10-01	6.5214
1996-01-01	8.4776
1996-04-01	34.1479
1996-07-01	37.1062
1996-10-01	5.7705
1997-01-01	7.5675
1997-04-01	4.6997
1997-07-01	3.8990
1997-10-01	4.4650
1998-01-01	2.5029
1998-04-01	7.1080
1998-07-01	1.8726
1998-10-01	2.7300
1999-01-01	3.7404
1999-04-01	7.0177
1999-07-01	5.7230
1999-10-01	5.5549
2000-01-01	7.2024
2000-04-01	3.7532
2000-07-01	2.9099
2000-10-01	4.5250
2001-01-01	6.4756
2001-04-01	7.5550
2001-07-01	3.3037
2001-10-01	6.5342
2002-01-01	6.1220
2002-04-01	8.2599
2002-07-01	5.5766
2002-10-01	7.2226
2003-01-01	9.1274
2003-04-01	10.5808
2003-07-01	7.0787
2003-10-01	7.5839
2004-01-01	11.8805
2004-04-01	8.8332
2004-07-01	6.8449
2004-10-01	11.6098
2005-01-01	14.9494
2005-04-01	14.0199
2005-07-01	12.6527
2005-10-01	13.7449
2006-01-01	18.6688
2006-04-01	13.7713
2006-07-01	11.6255
2006-10-01	20.4886
2007-01-01	23.8823
2007-04-01	32.8153
2007-07-01	11.3112
2007-10-01	13.5519
2008-01-01	15.6100
2008-04-01	33.4287
2008-07-01	23.3705
2008-10-01	14.9501
2009-01-01	38.9851
2009-04-01	44.0752
2009-07-01	33.0867
2009-10-01	21.8987
2010-01-01	38.4232
2010-04-01	23.0059
2010-07-01	15.2980
2010-10-01	17.3872
2011-01-01	44.1167
2011-04-01	38.1667
2011-07-01	25.6240
2011-10-01	12.9300
2012-01-01	46.0485
2012-04-01	28.5308
2012-07-01	27.7487
2012-10-01	23.3869
2013-01-01	39.1564
2013-04-01	37.2232
2013-07-01	27.4537
2013-10-01	19.1495
2014-01-01	32.2553
2014-04-01	32.8692
2014-07-01	26.1338
2014-10-01	23.0897
2015-01-01	30.9006
2015-04-01	26.6838