Quarter	Billions of US Dollars
1973-01-01	0.0110
1973-04-01	0.0122
1973-07-01	0.0118
1973-10-01	0.0106
1974-01-01	0.0103
1974-04-01	0.0104
1974-07-01	0.0105
1974-10-01	0.0112
1975-01-01	0.0119
1975-04-01	0.0124
1975-07-01	0.0110
1975-10-01	0.0111
1976-01-01	0.0107
1976-04-01	0.0105
1976-07-01	0.1101
1976-10-01	0.1101
1977-01-01	0.1101
1977-04-01	0.1406
1977-07-01	0.1438
1977-10-01	0.1481
1978-01-01	0.1511
1978-04-01	0.1515
1978-07-01	0.1902
1978-10-01	0.1883
1979-01-01	0.1860
1979-04-01	0.1868
1979-07-01	0.1904
1979-10-01	0.1899
1980-01-01	0.1821
1980-04-01	0.1422
1980-07-01	0.1951
1980-10-01	0.1935
1981-01-01	0.1916
1981-04-01	0.1897
1981-07-01	0.1902
1981-10-01	0.1909
1982-01-01	0.1895
1982-04-01	0.1879
1982-07-01	0.1873
1982-10-01	0.2886
1983-01-01	0.4307
1983-04-01	0.5806
1983-07-01	0.5711
1983-10-01	0.5911
1984-01-01	0.5911
1984-04-01	0.5911
1984-07-01	0.6311
1984-10-01	0.6461
1985-01-01	0.6461
1985-04-01	0.6461
1985-07-01	0.6461
1985-10-01	0.5591
1986-01-01	0.5591
1986-04-01	0.6119
1986-07-01	0.6451
1986-10-01	0.7996
1987-01-01	0.9098
1987-04-01	1.1992
1987-07-01	1.2337
1987-10-01	1.3226
1988-01-01	1.3098
1988-04-01	1.2685
1988-07-01	1.3355
1988-10-01	1.4170
1989-01-01	1.4936
1989-04-01	1.4549
1989-07-01	1.4696
1989-10-01	1.3572
1990-01-01	1.1878
1990-04-01	1.0636
1990-07-01	1.0892
1990-10-01	1.2346
1991-01-01	1.3299
1991-04-01	1.2811
1991-07-01	1.3347
1991-10-01	1.2932
1992-01-01	1.1338
1992-04-01	1.0270
1992-07-01	0.7633
1992-10-01	0.6680
1993-01-01	0.6207
1993-04-01	0.5884
1993-07-01	0.6403
1993-10-01	0.9895
1994-01-01	1.0999
1994-04-01	1.2119
1994-07-01	1.6165
1994-10-01	1.6185
1995-01-01	1.6414
1995-04-01	1.6632
1995-07-01	1.9120
1995-10-01	1.7765
1996-01-01	1.7310
1996-04-01	1.6467
1996-07-01	1.5604
1996-10-01	1.5776
1997-01-01	1.5359
1997-04-01	1.5724
1997-07-01	1.5373
1997-10-01	1.5187
1998-01-01	1.4641
1998-04-01	1.7031
1998-07-01	1.6582
1998-10-01	1.5686
1999-01-01	1.5244
1999-04-01	1.5352
1999-07-01	1.5216
1999-10-01	1.9278
2000-01-01	1.9804
2000-04-01	2.2001
2000-07-01	2.0410
2000-10-01	2.1138
2001-01-01	2.0969
2001-04-01	1.8021
2001-07-01	1.9791
2001-10-01	1.8561
2002-01-01	1.8096
2002-04-01	2.1725
2002-07-01	2.0836
2002-10-01	1.8985
2003-01-01	2.0450
2003-04-01	2.0581
2003-07-01	2.4940
2003-10-01	2.5518
2004-01-01	2.8966
2004-04-01	3.2856
2004-07-01	3.5701
2004-10-01	3.8802
2005-01-01	4.4721
2005-04-01	4.3568
2005-07-01	4.8809
2005-10-01	5.5687
2006-01-01	5.8108
2006-04-01	5.4619
2006-07-01	5.5584
2006-10-01	4.9978
2007-01-01	5.6126
2007-04-01	6.1065
2007-07-01	7.0370
2007-10-01	7.4261
2008-01-01	8.0388
2008-04-01	8.3149
2008-07-01	8.2483
2008-10-01	7.5365
2009-01-01	7.0865
2009-04-01	8.7304
2009-07-01	8.8231
2009-10-01	8.9565
2010-01-01	8.7805
2010-04-01	8.7020
2010-07-01	8.6845
2010-10-01	7.8596
2011-01-01	7.6684
2011-04-01	8.0486
2011-07-01	7.5280
2011-10-01	7.6162
2012-01-01	7.9364
2012-04-01	8.1503
2012-07-01	9.5400
2012-10-01	10.7275
2013-01-01	10.8823
2013-04-01	11.2023
2013-07-01	11.2310
2013-10-01	11.1685
2014-01-01	11.3884
2014-04-01	10.2129
2014-07-01	11.4544
2014-10-01	10.9523
2015-01-01	11.7646
2015-04-01	11.8798