Quarter	Billions of US Dollars
1987-01-01	0.0073
1987-04-01	0.0071
1987-07-01	0.0071
1987-10-01	0.0074
1988-01-01	0.0073
1988-04-01	0.0071
1996-01-01	0.0900
1996-04-01	0.0900
1996-07-01	0.1900
1996-10-01	0.3735
1997-01-01	0.3435
1997-04-01	1.1362
1997-07-01	1.2465
1997-10-01	1.2624
1998-01-01	1.2632
1998-04-01	1.2467
1998-07-01	1.2687
1998-10-01	1.3389
1999-01-01	1.2693
1999-04-01	1.2697
1999-07-01	1.3327
1999-10-01	1.3861
2000-01-01	1.3863
2000-04-01	1.3640
2000-07-01	1.3618
2000-10-01	1.7732
2001-01-01	1.7484
2001-04-01	2.0094
2001-07-01	1.9349
2001-10-01	1.9748
2002-01-01	1.9806
2002-04-01	4.4085
2002-07-01	4.8551
2002-10-01	6.0562
2003-01-01	6.0975
2003-04-01	6.1484
2003-07-01	6.1765
2003-10-01	6.5613
2004-01-01	6.6425
2004-04-01	6.6397
2004-07-01	7.9060
2004-10-01	8.7090
2005-01-01	9.0825
2005-04-01	9.4356
2005-07-01	10.2452
2005-10-01	10.4404
2006-01-01	11.6774
2006-04-01	11.7373
2006-07-01	11.7478
2006-10-01	12.7635
2007-01-01	12.6898
2007-04-01	12.5939
2007-07-01	12.8945
2007-10-01	12.9351
2008-01-01	14.1669
2008-04-01	14.1633
2008-07-01	14.0538
2008-10-01	13.7248
2009-01-01	13.5091
2009-04-01	12.5110
2009-07-01	16.5760
2009-10-01	15.7413
2010-01-01	16.0913
2010-04-01	16.2963
2010-07-01	17.5348
2010-10-01	17.3011
2011-01-01	17.2249
2011-04-01	16.3863
2011-07-01	16.3196
2011-10-01	16.0286
2012-01-01	16.4264
2012-04-01	17.9106
2012-07-01	17.2698
2012-10-01	18.0736
2013-01-01	16.9044
2013-04-01	19.8875
2013-07-01	19.8962
2013-10-01	19.9504
2014-01-01	19.8069
2014-04-01	19.8179
2014-07-01	18.4614
2014-10-01	18.9671
2015-01-01	23.0707
2015-04-01	22.8626