Quarter	Millions of US Dollars
1995-10-01	6689
1996-01-01	5605
1996-04-01	5593
1996-07-01	5787
1996-10-01	6361
1997-01-01	7776
1997-04-01	4222
1997-07-01	5714
1997-10-01	5270
1998-01-01	4300
1998-04-01	4324
1998-07-01	4898
1998-10-01	3924
1999-01-01	3736
1999-04-01	4235
1999-07-01	4785
1999-10-01	5072
2000-01-01	4460
2000-04-01	3715
2000-07-01	2986
2000-10-01	3993
2001-01-01	4334
2001-04-01	3829
2001-07-01	4475
2001-10-01	4458
2002-01-01	4498
2002-04-01	4870
2002-07-01	5939
2002-10-01	7902
2003-01-01	9721
2003-04-01	10257
2003-07-01	12781
2003-10-01	10989
2004-01-01	9767
2004-04-01	10297
2004-07-01	9842
2004-10-01	11590
2005-01-01	9093
2005-04-01	8861
2005-07-01	8801
2005-10-01	8588
2006-01-01	8155
2006-04-01	8757
2006-07-01	8028
2006-10-01	8994
2007-01-01	8053
2007-04-01	8295
2007-07-01	8827
2007-10-01	8884
2008-01-01	9399
2008-04-01	10277
2008-07-01	8094
2008-10-01	15267
2009-01-01	21927
2009-04-01	36343
2009-07-01	52275
2009-10-01	52603
2010-01-01	50928
2010-04-01	46704
2010-07-01	51701
2010-10-01	50944
2011-01-01	49395
2011-04-01	47918
2011-07-01	41562
2011-10-01	38255
2012-01-01	42859
2012-04-01	41462
2012-07-01	42933
2012-10-01	41769
2013-01-01	38938
2013-04-01	34791
2013-07-01	35358
2013-10-01	31869
2014-01-01	25336
2014-04-01	19583
2014-07-01	19601
2014-10-01	16518
2015-01-01	16747
2015-04-01	18382
2015-07-01	16656
2015-10-01	15809
2016-01-01	17885
2016-04-01	17448
2016-07-01	17257
2016-10-01	15606
2017-01-01	15017
2017-04-01	15658
2017-07-01	16430
2017-10-01	15734
2018-01-01	17068