Quarter	Billions of US Dollars
1987-01-01	0.0580
1987-04-01	0.0970
1987-07-01	0.2440
1987-10-01	0.3170
1988-01-01	0.5930
1988-04-01	0.2130
1988-07-01	0.2420
1988-10-01	0.2940
1989-01-01	0.1570
1989-04-01	0.1410
1989-07-01	0.2260
1989-10-01	0.3300
1990-01-01	0.3510
1990-04-01	1.2130
1990-07-01	2.7520
1990-10-01	4.0650
1991-01-01	2.9490
1991-04-01	1.9610
1991-07-01	2.5210
1991-10-01	2.0010
1992-01-01	2.7470
1992-04-01	3.2510
1992-07-01	2.9480
1992-10-01	2.4550
1993-01-01	2.2420
1993-04-01	2.5310
1994-10-01	0.0150
1995-01-01	0.4028
1995-04-01	0.4596
1995-07-01	0.7561
1995-10-01	0.8296
1996-01-01	0.7515
1996-04-01	1.1549
1996-07-01	1.2411
1996-10-01	1.3789
1997-01-01	1.3029
1997-04-01	1.3152
1997-07-01	1.4571
1997-10-01	1.7179
1998-01-01	1.5997
1998-04-01	1.4552
1998-07-01	2.5266
1998-10-01	2.8270
1999-01-01	2.1941
1999-04-01	2.1942
1999-07-01	2.7679
1999-10-01	3.3123
2000-01-01	1.9141
2000-04-01	2.2282
2000-07-01	3.4563
2000-10-01	3.6627
2001-01-01	4.0332
2001-04-01	5.2647
2001-07-01	5.8398
2001-10-01	4.6082
2002-01-01	4.7034
2002-04-01	5.8471
2002-07-01	3.6779
2002-10-01	4.4667
2003-01-01	4.0751
2003-04-01	3.5038
2003-07-01	3.2031
2003-10-01	4.3528
2004-01-01	3.2315
2004-04-01	2.8259
2004-07-01	2.5168
2004-10-01	2.9431
2005-01-01	2.7381
2005-04-01	2.6185
2005-07-01	2.6651
2005-10-01	2.0167
2006-01-01	2.6466
2006-04-01	3.3520
2006-07-01	2.9183
2006-10-01	3.4545
2007-01-01	3.6281
2007-04-01	3.5037
2007-07-01	4.7865
2007-10-01	4.3975
2008-01-01	3.2908
2008-04-01	4.2632
2008-07-01	3.3795
2008-10-01	5.7461
2009-01-01	2.3607
2009-04-01	2.8976
2009-07-01	2.3984
2009-10-01	3.4021
2010-01-01	5.5693
2010-04-01	4.6820
2010-07-01	4.7740
2010-10-01	4.1891
2011-01-01	4.0335
2011-04-01	6.3784
2011-07-01	5.9880
2011-10-01	6.3276
2012-01-01	7.0114
2012-04-01	6.8202
2012-07-01	7.0514
2012-10-01	7.4810
2013-01-01	8.0799
2013-04-01	6.9988
2013-07-01	7.7974
2013-10-01	9.1390
2014-01-01	8.7418
2014-04-01	11.1855
2014-07-01	11.2142
2014-10-01	8.6358
2015-01-01	11.8320
2015-04-01	10.2377