Quarter	Billions of US Dollars
1966-01-01	0.065
1966-04-01	0.030
1966-07-01	0.015
1967-01-01	0.014
1967-04-01	0.105
1967-10-01	0.022
1968-01-01	0.189
1968-04-01	0.350
1968-07-01	0.140
1968-10-01	0.063
1969-01-01	0.137
1969-04-01	0.030
1969-07-01	0.030
1969-10-01	0.150
1970-01-01	0.027
1970-07-01	0.075
1970-10-01	0.015
1971-01-01	0.586
1971-04-01	0.201
1971-07-01	0.128
1971-10-01	0.385
1972-01-01	1.165
1972-04-01	1.564
1972-07-01	1.511
1972-10-01	1.748
1973-01-01	1.654
1973-04-01	1.203
1973-07-01	0.951
1973-10-01	1.386
1974-01-01	1.006
1974-04-01	1.175
1974-07-01	1.377
1974-10-01	2.051
1975-01-01	3.446
1975-04-01	4.207
1975-07-01	3.035
1975-10-01	4.777
1976-01-01	6.848
1976-04-01	5.391
1976-07-01	4.454
1976-10-01	6.130
1977-01-01	5.189
1977-04-01	5.738
1977-07-01	4.626
1977-10-01	5.303
1978-01-01	6.170
1978-04-01	6.795
1978-07-01	4.240
1978-10-01	4.138
1979-01-01	7.164
1979-04-01	5.469
1979-07-01	5.037
1979-10-01	4.052
1980-01-01	3.825
1980-04-01	5.852
1980-07-01	3.226
1980-10-01	4.554
1981-01-01	3.946
1981-04-01	5.054
1981-07-01	5.347
1981-10-01	8.711
1982-01-01	10.120
1982-04-01	7.241
1982-07-01	8.265
1982-10-01	7.518
1983-01-01	10.895
1983-04-01	7.293
1983-07-01	3.709
1983-10-01	11.385
1984-01-01	13.880
1984-04-01	9.563
1984-07-01	15.613
1984-10-01	21.980
1985-01-01	19.645
1985-04-01	18.744
1985-07-01	20.484
1985-10-01	18.106
1986-01-01	24.154
1986-04-01	36.960
1986-07-01	35.764
1986-10-01	27.122
1987-01-01	26.517
1987-04-01	26.816
1987-07-01	21.267
1987-10-01	8.418
1988-01-01	19.419
1988-04-01	31.698
1988-07-01	34.200
1988-10-01	21.194
1989-01-01	39.186
1989-04-01	38.945
1989-07-01	26.800
1989-10-01	32.343
1990-01-01	24.865
1990-04-01	11.685
1990-07-01	28.479
1990-10-01	25.111
1991-01-01	32.885
1991-04-01	35.760
1991-07-01	29.365
1991-10-01	27.000
1992-01-01	20.763
1992-04-01	25.049
1992-07-01	4.057
1992-10-01	31.033
1993-01-01	22.328
1993-04-01	6.000
1993-07-01	37.225
1993-10-01	32.582
1994-01-01	52.679
1994-04-01	24.470
1994-07-01	51.460
1994-10-01	34.843
1995-01-01	38.011
1995-04-01	34.924
1995-07-01	43.700
1995-10-01	43.001
1996-01-01	69.388
1996-04-01	63.370
1996-07-01	72.260
1996-10-01	80.472
1997-01-01	79.104
1997-04-01	76.892
1997-07-01	79.134
1997-10-01	14.204
1998-01-01	94.563
1998-04-01	120.855
1998-07-01	68.979
1998-10-01	48.287
1999-01-01	143.658
1999-04-01	202.027
1999-07-01	176.388
1999-10-01	106.115
2000-01-01	139.141
2000-04-01	175.434
2000-07-01	175.822
2000-10-01	193.865
2001-01-01	318.572
2001-04-01	283.334
2001-07-01	165.711
2001-10-01	261.483
2002-01-01	216.987
2002-04-01	228.467
2002-07-01	93.369
2002-10-01	141.339
2003-01-01	213.157
2003-04-01	248.302
2003-07-01	253.343
2003-10-01	307.410
2004-01-01	309.143
2004-04-01	234.517
2004-07-01	247.653
2004-10-01	304.871
2005-01-01	313.500
2005-04-01	350.698
2005-07-01	143.829
2005-10-01	417.475
2006-01-01	367.028
2006-04-01	403.193
2006-07-01	360.078
2006-10-01	565.293
2007-01-01	522.474
2007-04-01	682.710
2007-07-01	195.182
2007-10-01	260.538
2008-01-01	153.317
2008-04-01	701.557
2008-07-01	204.147
2008-10-01	463.944
2009-01-01	336.787
2009-04-01	487.335
2009-07-01	243.940
2009-10-01	241.965
2010-01-01	233.398
2010-04-01	-33.608
2010-07-01	161.381
2010-10-01	42.433
2011-01-01	112.337
2011-04-01	57.276
2011-07-01	-63.102
2011-10-01	4.324
2012-01-01	92.079
2012-04-01	-135.048
2012-07-01	7.061
2012-10-01	105.594
2013-01-01	-52.934
2013-04-01	-46.287
2013-07-01	19.004
2013-10-01	140.308
2014-01-01	-64.098
2014-04-01	113.476
2014-07-01	69.890
2014-10-01	-17.552
2015-01-01	92.677
2015-04-01	125.756