Quarter	Billions of US Dollars
1993-07-01	13.758
1993-10-01	17.998
1994-01-01	14.926
1994-04-01	9.196
1994-07-01	6.841
1994-10-01	19.392
1995-01-01	21.340
1995-04-01	12.659
1995-07-01	17.923
1995-10-01	15.813
1996-01-01	31.160
1996-04-01	29.611
1996-07-01	19.201
1996-10-01	35.038
1997-01-01	33.114
1997-04-01	25.462
1997-07-01	34.192
1997-10-01	17.624
1998-01-01	51.690
1998-04-01	63.406
1998-07-01	45.736
1998-10-01	23.763
1999-01-01	81.679
1999-04-01	116.629
1999-07-01	103.872
1999-10-01	88.686
2000-01-01	83.942
2000-04-01	88.332
2000-07-01	83.088
2000-10-01	87.087
2001-01-01	152.968
2001-04-01	139.593
2001-07-01	70.078
2001-10-01	138.179
2002-01-01	113.706
2002-04-01	108.090
2002-07-01	60.141
2002-10-01	72.920
2003-01-01	161.574
2003-04-01	186.773
2003-07-01	116.981
2003-10-01	161.187
2004-01-01	171.036
2004-04-01	155.228
2004-07-01	161.401
2004-10-01	195.174
2005-01-01	196.335
2005-04-01	252.110
2005-07-01	69.455
2005-10-01	238.033
2006-01-01	273.001
2006-04-01	218.330
2006-07-01	224.822
2006-10-01	360.371
2007-01-01	342.344
2007-04-01	408.487
2007-07-01	72.244
2007-10-01	168.965
2008-01-01	83.196
2008-04-01	389.564
2008-07-01	39.345
2008-10-01	267.259
2009-01-01	187.825
2009-04-01	350.078
2009-07-01	143.253
2009-10-01	129.827
2010-01-01	172.991
2010-04-01	-14.507
2010-07-01	76.176
2010-10-01	3.373
2011-01-01	79.306
2011-04-01	28.246
2011-07-01	-19.762
2011-10-01	28.363
2012-01-01	151.479
2012-04-01	-78.751
2012-07-01	-34.234
2012-10-01	49.023
2013-01-01	-159.004
2013-04-01	-44.426
2013-07-01	16.417
2013-10-01	60.425
2014-01-01	-72.524
2014-04-01	35.104
2014-07-01	-1.423
2014-10-01	11.354
2015-01-01	50.734
2015-04-01	27.280