Quarter	Billions of US Dollars
1997-07-01	5034.652
1997-10-01	5093.404
1998-01-01	5042.596
1998-04-01	5234.796
1998-07-01	5674.687
1998-10-01	5789.595
1999-01-01	5355.404
1999-04-01	5301.355
1999-07-01	5559.974
1999-10-01	5381.979
2000-01-01	5234.370
2000-04-01	5350.401
2000-07-01	5035.105
2000-10-01	5440.059
2001-01-01	5318.292
2001-04-01	5201.736
2001-07-01	5661.674
2001-10-01	5528.379
2002-01-01	5525.533
2002-04-01	6387.189
2002-07-01	6355.133
2002-10-01	6817.458
2003-01-01	7138.339
2003-04-01	7588.533
2003-07-01	7798.117
2003-10-01	8549.400
2004-01-01	8355.834
2004-04-01	8472.272
2004-07-01	8743.374
2004-10-01	9745.068
2005-01-01	9396.460
2005-04-01	9056.006
2005-07-01	9166.764
2005-10-01	9195.898
2006-01-01	9688.981
2006-04-01	10472.714
2006-07-01	10647.681
2006-10-01	11322.515
2007-01-01	11712.099
2007-04-01	12196.485
2007-07-01	13070.584
2007-10-01	13891.195
2008-01-01	15275.795
2008-04-01	15468.486
2008-07-01	14215.935
2008-10-01	13884.776
2009-01-01	13266.684
2009-04-01	14046.035
2009-07-01	14484.812
2009-10-01	14217.639
2010-01-01	13324.385
2010-04-01	12254.745
2010-07-01	13649.518
2010-10-01	13383.515
2011-01-01	14342.469
2011-04-01	14715.565
2011-07-01	13773.621
2011-10-01	13102.304
2012-01-01	13486.218
2012-04-01	12745.984
2012-07-01	13011.013
2012-10-01	13119.023
2013-01-01	12673.387
2013-04-01	12867.110
2013-07-01	13207.753
2013-10-01	13405.141
2014-01-01	13392.503
2014-04-01	13192.545
2014-07-01	12127.797
2014-10-01	11723.807
2015-01-01	10448.156
2015-04-01	10904.015
2015-07-01	10918.285
2015-10-01	10606.953
2016-01-01	11154.279
2016-04-01	10915.776
2016-07-01	10976.241
2016-10-01	10433.042
2017-01-01	10666.343
2017-04-01	11411.746
2017-07-01	11825.262
2017-10-01	12084.298
2018-01-01	12467.644