Quarter	Billions of US Dollars
1993-07-01	13.218
1993-10-01	12.901
1994-01-01	15.131
1994-04-01	15.574
1994-07-01	16.413
1994-10-01	16.674
1995-01-01	18.505
1995-04-01	19.941
1995-07-01	20.023
1995-10-01	21.216
1996-01-01	21.612
1996-04-01	22.500
1996-07-01	22.703
1996-10-01	23.265
1997-01-01	23.014
1997-04-01	23.990
1997-07-01	23.253
1997-10-01	26.293
1998-01-01	25.534
1998-04-01	25.733
1998-07-01	27.021
1998-10-01	25.797
1999-01-01	24.436
1999-04-01	23.310
1999-07-01	25.704
1999-10-01	24.091
2000-01-01	22.933
2000-04-01	21.695
2000-07-01	20.956
2000-10-01	21.278
2001-01-01	18.878
2001-04-01	18.102
2001-07-01	18.657
2001-10-01	18.320
2002-01-01	17.147
2002-04-01	19.364
2002-07-01	18.662
2002-10-01	17.127
2003-01-01	17.517
2003-04-01	18.996
2003-07-01	19.790
2003-10-01	20.971
2004-01-01	20.301
2004-04-01	24.507
2004-07-01	26.941
2004-10-01	29.513
2005-01-01	26.811
2005-04-01	26.166
2005-07-01	26.249
2005-10-01	26.606
2006-01-01	27.795
2006-04-01	23.759
2006-07-01	23.216
2006-10-01	23.931
2007-01-01	23.407
2007-04-01	23.414
2007-07-01	24.252
2007-10-01	25.082
2008-01-01	26.027
2008-04-01	25.812
2008-07-01	24.312
2008-10-01	23.611
2009-01-01	37.953
2009-04-01	45.745
2009-07-01	53.597
2009-10-01	49.318
2010-01-01	56.303
2010-04-01	56.411
2010-07-01	60.570
2010-10-01	61.943
2011-01-01	66.016
2011-04-01	71.258
2011-07-01	70.607
2011-10-01	72.161
2012-01-01	81.677
2012-04-01	80.806
2012-07-01	90.251
2012-10-01	93.443
2013-01-01	103.882
2013-04-01	109.170
2013-07-01	122.267
2013-10-01	128.947
2014-01-01	144.430
2014-04-01	153.700
2014-07-01	146.995
2014-10-01	145.848
2015-01-01	129.429
2015-04-01	135.094