Quarter	Billions of US Dollars
1997-07-01	16389.626
1997-10-01	16308.005
1998-01-01	16125.640
1998-04-01	16285.419
1998-07-01	17008.232
1998-10-01	18144.348
1999-01-01	17348.583
1999-04-01	17284.841
1999-07-01	18468.963
1999-10-01	18675.630
2000-01-01	18499.653
2000-04-01	18593.349
2000-07-01	18153.298
2000-10-01	18526.122
2001-01-01	17863.730
2001-04-01	17771.987
2001-07-01	18548.203
2001-10-01	18104.563
2002-01-01	17933.464
2002-04-01	19533.814
2002-07-01	19522.346
2002-10-01	20456.673
2003-01-01	20834.451
2003-04-01	21585.901
2003-07-01	22377.815
2003-10-01	23820.708
2004-01-01	23839.265
2004-04-01	23867.361
2004-07-01	24346.280
2004-10-01	26468.147
2005-01-01	25947.393
2005-04-01	25469.284
2005-07-01	25968.806
2005-10-01	26009.990
2006-01-01	26773.950
2006-04-01	28295.045
2006-07-01	28750.898
2006-10-01	29968.431
2007-01-01	30636.672
2007-04-01	31522.490
2007-07-01	33438.515
2007-10-01	34927.151
2008-01-01	37339.857
2008-04-01	37515.101
2008-07-01	35482.077
2008-10-01	34998.782
2009-01-01	33534.191
2009-04-01	35247.956
2009-07-01	36082.558
2009-10-01	35599.583
2010-01-01	35003.038
2010-04-01	33733.099
2010-07-01	36158.270
2010-10-01	36118.515
2011-01-01	37103.445
2011-04-01	37834.128
2011-07-01	36753.107
2011-10-01	36463.645
2012-01-01	36816.137
2012-04-01	36055.259
2012-07-01	36971.351
2012-10-01	36738.115
2013-01-01	35524.713
2013-04-01	35272.839
2013-07-01	36228.680
2013-10-01	36304.102
2014-01-01	36392.468
2014-04-01	36693.636
2014-07-01	34863.368
2014-10-01	33921.141
2015-01-01	32199.478
2015-04-01	33073.149
2015-07-01	32938.927
2015-10-01	32930.676
2016-01-01	34231.554
2016-04-01	34415.984
2016-07-01	34822.735
2016-10-01	33429.421
2017-01-01	34196.540
2017-04-01	35473.810
2017-07-01	36312.982
2017-10-01	36909.749
2018-01-01	37723.581