Quarter	Billions of US Dollars
1998-10-01	9.947
1999-01-01	8.876
1999-04-01	9.329
1999-07-01	10.037
1999-10-01	9.548
2000-01-01	9.226
2000-04-01	9.651
2000-07-01	9.254
2000-10-01	10.739
2001-01-01	11.184
2001-04-01	12.484
2001-07-01	15.111
2001-10-01	16.170
2002-01-01	17.553
2002-04-01	22.119
2002-07-01	22.972
2002-10-01	23.133
2003-01-01	26.610
2003-04-01	28.660
2003-07-01	29.329
2003-10-01	30.923
2004-01-01	31.937
2004-04-01	34.505
2004-07-01	35.242
2004-10-01	38.734
2005-01-01	38.089
2005-04-01	36.225
2005-07-01	36.739
2005-10-01	36.668
2006-01-01	38.815
2006-04-01	41.838
2006-07-01	42.760
2006-10-01	45.952
2007-01-01	46.282
2007-04-01	47.857
2007-07-01	51.809
2007-10-01	57.510
2008-01-01	64.144
2008-04-01	70.318
2008-07-01	63.891
2008-10-01	59.261
2009-01-01	54.592
2009-04-01	68.115
2009-07-01	75.436
2009-10-01	73.255
2010-01-01	75.607
2010-04-01	69.244
2010-07-01	90.047
2010-10-01	82.176
2011-01-01	90.967
2011-04-01	93.079
2011-07-01	91.309
2011-10-01	85.143
2012-01-01	99.276
2012-04-01	92.917
2012-07-01	101.317
2012-10-01	105.230
2013-01-01	102.243
2013-04-01	100.810
2013-07-01	102.776
2013-10-01	101.408
2014-01-01	102.622
2014-04-01	102.089
2014-07-01	94.722
2014-10-01	91.044
2015-01-01	82.192
2015-04-01	84.066
2015-07-01	85.226
2015-10-01	83.455
2016-01-01	88.210
2016-04-01	84.727
2016-07-01	84.028
2016-10-01	76.651
2017-01-01	83.733
2017-04-01	91.476
2017-07-01	86.008
2017-10-01	87.862
2018-01-01	94.327