Quarter	Millions of US Dollars
1995-10-01	67781
1996-01-01	66955
1996-04-01	65259
1996-07-01	67992
1996-10-01	70210
1997-01-01	73527
1997-04-01	65424
1997-07-01	69162
1997-10-01	67341
1998-01-01	66829
1998-04-01	65939
1998-07-01	68065
1998-10-01	64922
1999-01-01	64067
1999-04-01	60730
1999-07-01	62536
1999-10-01	61288
2000-01-01	57803
2000-04-01	55843
2000-07-01	53407
2000-10-01	58081
2001-01-01	60015
2001-04-01	56147
2001-07-01	60513
2001-10-01	58642
2002-01-01	61914
2002-04-01	75415
2002-07-01	78865
2002-10-01	85633
2003-01-01	86660
2003-04-01	88840
2003-07-01	93641
2003-10-01	99330
2004-01-01	95336
2004-04-01	96876
2004-07-01	100788
2004-10-01	111494
2005-01-01	106284
2005-04-01	104526
2005-07-01	108766
2005-10-01	105277
2006-01-01	110072
2006-04-01	116256
2006-07-01	117384
2006-10-01	126731
2007-01-01	121966
2007-04-01	127458
2007-07-01	145637
2007-10-01	150713
2008-01-01	159722
2008-04-01	165690
2008-07-01	146388
2008-10-01	139164
2009-01-01	163359
2009-04-01	191513
2009-07-01	238040
2009-10-01	243013
2010-01-01	237248
2010-04-01	221713
2010-07-01	250028
2010-10-01	251804
2011-01-01	265373
2011-04-01	265445
2011-07-01	248249
2011-10-01	247742
2012-01-01	269116
2012-04-01	262408
2012-07-01	281524
2012-10-01	292428
2013-01-01	288544
2013-04-01	274130
2013-07-01	279279
2013-10-01	274985
2014-01-01	282574
2014-04-01	268079
2014-07-01	256674
2014-10-01	224498
2015-01-01	209562
2015-04-01	211956
2015-07-01	197417
2015-10-01	190150
2016-01-01	209475
2016-04-01	208711
2016-07-01	218160
2016-10-01	206528
2017-01-01	213994
2017-04-01	217241
2017-07-01	230764
2017-10-01	226631
2018-01-01	242633