Quarter	Billions of US Dollars
1993-07-01	249.267
1993-10-01	241.196
1994-01-01	266.903
1994-04-01	288.449
1994-07-01	322.446
1994-10-01	335.140
1995-01-01	383.752
1995-04-01	422.972
1995-07-01	384.639
1995-10-01	378.301
1996-01-01	378.175
1996-04-01	382.504
1996-07-01	395.227
1996-10-01	390.431
1997-01-01	372.148
1997-04-01	412.440
1997-07-01	390.998
1997-10-01	361.449
1998-01-01	346.450
1998-04-01	316.769
1998-07-01	320.276
1998-10-01	363.236
1999-01-01	339.059
1999-04-01	329.529
1999-07-01	374.247
1999-10-01	382.542
2000-01-01	368.193
2000-04-01	382.050
2000-07-01	378.147
2000-10-01	350.418
2001-01-01	318.372
2001-04-01	319.357
2001-07-01	334.892
2001-10-01	299.589
2002-01-01	283.604
2002-04-01	317.895
2002-07-01	308.914
2002-10-01	310.547
2003-01-01	304.326
2003-04-01	304.055
2003-07-01	328.741
2003-10-01	347.080
2004-01-01	359.923
2004-04-01	355.118
2004-07-01	350.557
2004-10-01	371.856
2005-01-01	364.087
2005-04-01	350.109
2005-07-01	343.640
2005-10-01	337.323
2006-01-01	339.554
2006-04-01	347.909
2006-07-01	339.389
2006-10-01	343.116
2007-01-01	353.663
2007-04-01	357.006
2007-07-01	386.507
2007-10-01	397.474
2008-01-01	447.297
2008-04-01	425.371
2008-07-01	436.938
2008-10-01	499.974
2009-01-01	450.389
2009-04-01	453.055
2009-07-01	478.915
2009-10-01	456.611
2010-01-01	443.813
2010-04-01	461.474
2010-07-01	492.339
2010-10-01	506.882
2011-01-01	497.923
2011-04-01	509.965
2011-07-01	529.417
2011-10-01	518.775
2012-01-01	494.087
2012-04-01	507.138
2012-07-01	517.844
2012-10-01	468.322
2013-01-01	414.183
2013-04-01	385.785
2013-07-01	386.567
2013-10-01	364.206
2014-01-01	367.822
2014-04-01	376.535
2014-07-01	348.829
2014-10-01	315.362
2015-01-01	311.528
2015-04-01	302.482