Quarter	Billions of US Dollars
1999-01-01	146.745
1999-04-01	144.203
1999-07-01	149.943
1999-10-01	141.281
2000-01-01	144.001
2000-04-01	145.602
2000-07-01	134.883
2000-10-01	136.906
2001-01-01	136.711
2001-04-01	132.726
2001-07-01	144.331
2001-10-01	135.522
2002-01-01	140.158
2002-04-01	161.176
2002-07-01	163.685
2002-10-01	169.591
2003-01-01	184.323
2003-04-01	201.240
2003-07-01	196.058
2003-10-01	204.370
2004-01-01	207.350
2004-04-01	213.756
2004-07-01	223.593
2004-10-01	229.250
2005-01-01	244.319
2005-04-01	245.051
2005-07-01	243.691
2005-10-01	220.790
2006-01-01	232.653
2006-04-01	253.079
2006-07-01	246.386
2006-10-01	246.087
2007-01-01	262.018
2007-04-01	277.631
2007-07-01	301.933
2007-10-01	275.350
2008-01-01	303.820
2008-04-01	298.452
2008-07-01	278.062
2008-10-01	289.585
2009-01-01	286.763
2009-04-01	311.569
2009-07-01	321.174
2009-10-01	345.961
2010-01-01	331.278
2010-04-01	320.875
2010-07-01	360.408
2010-10-01	345.816
2011-01-01	363.116
2011-04-01	378.269
2011-07-01	369.098
2011-10-01	354.977
2012-01-01	373.884
2012-04-01	367.138
2012-07-01	376.244
2012-10-01	389.104
2013-01-01	381.371
2013-04-01	384.378
2013-07-01	400.852
2013-10-01	398.076
2014-01-01	405.788
2014-04-01	417.095
2014-07-01	384.280
2014-10-01	391.611
2015-01-01	359.366
2015-04-01	364.997
2015-07-01	370.203
2015-10-01	357.220
2016-01-01	389.227
2016-04-01	387.077
2016-07-01	383.088
2016-10-01	359.030
2017-01-01	356.069
2017-04-01	379.715
2017-07-01	391.306
2017-10-01	394.590
2018-01-01	400.819