Quarter	Billions of US Dollars
1972-07-01	0.02500
1972-10-01	0.02500
1973-01-01	0.02500
1973-04-01	0.04500
1973-07-01	0.04500
1973-10-01	0.04500
1974-01-01	0.04500
1974-04-01	0.10673
1974-07-01	0.10626
1974-10-01	0.10715
1975-01-01	0.10800
1975-04-01	0.14296
1975-07-01	0.13973
1975-10-01	0.14019
1976-01-01	0.14049
1976-04-01	0.24810
1976-07-01	0.24963
1976-10-01	0.28808
1977-01-01	0.28921
1977-04-01	0.35730
1977-07-01	0.41792
1977-10-01	0.51381
1978-01-01	0.66264
1978-04-01	0.89340
1978-07-01	0.96358
1978-10-01	1.26857
1979-01-01	1.32452
1979-04-01	1.44688
1979-07-01	1.49366
1979-10-01	1.49248
1980-01-01	1.44411
1980-04-01	1.49773
1980-07-01	1.49033
1980-10-01	1.46361
1981-01-01	1.43374
1981-04-01	1.34423
1981-07-01	1.34922
1981-10-01	1.37158
1982-01-01	1.34132
1982-04-01	1.29872
1982-07-01	1.25560
1982-10-01	1.26170
1983-01-01	1.20758
1983-04-01	1.16722
1983-07-01	1.14030
1983-10-01	1.05123
1984-01-01	1.05506
1984-04-01	1.04379
1984-07-01	1.00538
1984-10-01	0.99713
1985-01-01	0.96467
1985-04-01	1.43046
1985-07-01	1.45088
1985-10-01	1.29338
1986-01-01	1.30266
1986-04-01	1.29491
1986-07-01	1.40172
1986-10-01	1.36302
1987-01-01	1.39375
1987-04-01	1.34535
1987-07-01	1.29908
1987-10-01	1.33222
1988-01-01	1.44245
1988-04-01	1.46979
1988-07-01	1.55699
1988-10-01	1.57093
1989-01-01	1.48830
1989-04-01	1.49850
1989-07-01	1.55883
1989-10-01	1.59549
1990-01-01	1.55178
1990-04-01	1.44706
1990-07-01	1.49299
1990-10-01	1.49068
1991-01-01	1.35377
1991-04-01	1.33615
1991-07-01	1.36994
1991-10-01	1.43626
1992-01-01	1.37507
1992-04-01	1.41414
1992-07-01	1.33396
1992-10-01	1.21403
1993-01-01	1.16992
1993-04-01	0.68047
1993-07-01	0.60780
1993-10-01	0.57091
1994-01-01	0.51583
1994-04-01	0.44435
1994-07-01	0.35246
1994-10-01	0.34790
1995-01-01	0.38836
1995-04-01	0.22104
1995-07-01	0.10173
2012-10-01	0.27500
2013-01-01	0.27500
2013-04-01	0.27500
2013-07-01	0.27500
2013-10-01	0.32500
2014-01-01	0.32500
2014-04-01	0.82426
2014-07-01	0.80464
2014-10-01	0.79657
2015-01-01	0.77135
2015-04-01	0.77920