Quarter	Billions of US Dollars
1978-04-01	0.0200
1978-07-01	0.0200
1978-10-01	0.0200
1979-01-01	0.0498
1979-04-01	0.0496
1979-07-01	0.0498
1979-10-01	0.0497
1980-01-01	0.0501
1980-04-01	0.0501
1980-07-01	0.0502
1980-10-01	0.0501
1981-01-01	0.0499
1981-04-01	0.0494
1981-07-01	0.0493
1981-10-01	0.0493
1982-01-01	0.0493
1982-04-01	0.0491
1982-07-01	0.0491
1982-10-01	0.1491
1983-01-01	0.1490
1983-04-01	0.1290
1983-07-01	0.1288
1983-10-01	0.1286
1984-01-01	0.1284
1984-04-01	0.1285
1984-07-01	0.1485
1984-10-01	0.1479
1985-01-01	0.1475
1985-04-01	0.1475
1985-07-01	0.1505
1985-10-01	0.1524
1986-01-01	0.1278
1986-04-01	0.1303
1986-07-01	0.1326
1986-10-01	0.1314
1987-01-01	0.1343
1987-04-01	0.1340
1987-07-01	0.1342
1987-10-01	0.1405
1988-01-01	0.1399
1988-04-01	0.1378
1988-07-01	0.1372
1988-10-01	0.1397
1989-01-01	0.1379
1989-04-01	0.1347
1989-07-01	0.1359
1989-10-01	0.1349
1990-01-01	0.1318
1990-04-01	0.1327
1990-07-01	0.1363
1990-10-01	0.1372
1991-01-01	0.1355
1991-04-01	0.2103
1991-07-01	0.2140
1991-10-01	0.3290
1992-01-01	0.3290
1992-04-01	0.3790
1992-07-01	0.3790
1992-10-01	0.2790
1993-01-01	0.2790
1993-04-01	0.3510
1993-07-01	0.3510
1993-10-01	0.3916
1994-01-01	0.7190
1994-04-01	1.0326
1994-07-01	1.9889
1994-10-01	2.1960
1995-01-01	2.2612
1995-04-01	2.2590
1995-07-01	2.5753
1995-10-01	2.5708
1996-01-01	2.7825
1996-04-01	3.1414
1996-07-01	3.2827
1996-10-01	3.7254
1997-01-01	4.1464
1997-04-01	5.2302
1997-07-01	5.8923
1997-10-01	6.4492
1998-01-01	6.8095
1998-04-01	8.0072
1998-07-01	7.9468
1998-10-01	7.8914
1999-01-01	7.9045
1999-04-01	8.1813
1999-07-01	8.1805
1999-10-01	7.7472
2000-01-01	8.3437
2000-04-01	7.6308
2000-07-01	7.3050
2000-10-01	7.4147
2001-01-01	7.8506
2001-04-01	7.9364
2001-07-01	8.0910
2001-10-01	8.0227
2002-01-01	9.0642
2002-04-01	10.4068
2002-07-01	11.1204
2002-10-01	11.6466
2003-01-01	12.8048
2003-04-01	13.1857
2003-07-01	16.1762
2003-10-01	18.9378
2004-01-01	21.3460
2004-04-01	23.4201
2004-07-01	23.2440
2004-10-01	24.2700
2005-01-01	24.8075
2005-04-01	24.6639
2005-07-01	23.6977
2005-10-01	23.7541
2006-01-01	22.1939
2006-04-01	21.4190
2006-07-01	21.5901
2006-10-01	22.1849
2007-01-01	21.1364
2007-04-01	19.8694
2007-07-01	18.3598
2007-10-01	18.4943
2008-01-01	16.8951
2008-04-01	15.7402
2008-07-01	14.3993
2008-10-01	12.3666
2009-01-01	10.9225
2009-04-01	9.5410
2009-07-01	9.2211
2009-10-01	8.2319
2010-01-01	7.7680
2010-04-01	7.6942
2010-07-01	8.7998
2010-10-01	9.6245
2011-01-01	10.4490
2011-04-01	11.2759
2011-07-01	11.7180
2011-10-01	11.2660
2012-01-01	11.6607
2012-04-01	11.7448
2012-07-01	12.3483
2012-10-01	11.5011
2013-01-01	11.6226
2013-04-01	13.8476
2013-07-01	14.7912
2013-10-01	13.6243
2014-01-01	13.6822
2014-04-01	12.8718
2014-07-01	13.3109
2014-10-01	15.1897
2015-01-01	15.7053
2015-04-01	18.3702