Quarter	Billions of US Dollars
1989-10-01	9.289
1990-01-01	9.185
1990-04-01	9.253
1990-07-01	9.417
1990-10-01	9.307
1991-01-01	9.176
1991-04-01	9.155
1991-07-01	9.216
1991-10-01	9.102
1992-01-01	8.989
1992-04-01	9.099
1992-07-01	9.171
1992-10-01	7.943
1993-01-01	7.993
1993-04-01	8.027
1993-07-01	8.043
1993-10-01	6.307
1994-10-01	4.113
1995-01-01	3.983
1995-04-01	3.875
1995-07-01	2.977
1995-10-01	2.886
1996-01-01	2.519
1996-04-01	2.231
1996-07-01	2.018
1996-10-01	1.787
1997-01-01	1.666
1997-04-01	1.686
1997-07-01	1.311
1997-10-01	0.934
1998-01-01	1.043
1998-04-01	4.469
1998-07-01	6.071
1998-10-01	11.926
1999-01-01	14.325
1999-04-01	16.040
1999-07-01	14.373
1999-10-01	16.616
2000-01-01	15.911
2000-04-01	15.885
2000-07-01	15.102
2000-10-01	15.267
2001-01-01	15.489
2001-04-01	14.976
2001-07-01	15.518
2001-10-01	15.981
2002-01-01	17.418
2002-04-01	18.246
2002-07-01	24.618
2002-10-01	25.836
2003-01-01	38.488
2003-04-01	39.794
2003-07-01	42.722
2003-10-01	43.079
2004-01-01	44.260
2004-04-01	42.710
2004-07-01	45.176
2004-10-01	48.459
2005-01-01	55.457
2005-04-01	54.345
2005-07-01	58.065
2005-10-01	60.528
2006-01-01	66.871
2006-04-01	73.112
2006-07-01	78.041
2006-10-01	83.689
2007-01-01	95.604
2007-04-01	101.583
2007-07-01	105.984
2007-10-01	114.428
2008-01-01	126.501
2008-04-01	120.307
2008-07-01	119.332
2008-10-01	118.525
2009-01-01	121.653
2009-04-01	130.599
2009-07-01	143.109
2009-10-01	146.042
2010-01-01	154.995
2010-04-01	160.581
2010-07-01	175.915
2010-10-01	181.670
2011-01-01	184.565
2011-04-01	185.323
2011-07-01	191.488
2011-10-01	189.685
2012-01-01	202.242
2012-04-01	201.837
2012-07-01	214.014
2012-10-01	222.549
2013-01-01	246.169
2013-04-01	229.438
2013-07-01	227.874
2013-10-01	210.118
2014-01-01	224.544
2014-04-01	224.999
2014-07-01	229.001
2014-10-01	228.949
2015-01-01	246.428