Quarter	Millions of US Dollars
1995-10-01	7250
1996-01-01	9209
1996-04-01	8870
1996-07-01	9870
1996-10-01	8792
1997-01-01	9394
1997-04-01	9554
1997-07-01	10148
1997-10-01	9206
1998-01-01	9229
1998-04-01	8680
1998-07-01	9104
1998-10-01	8172
1999-01-01	7621
1999-04-01	6814
1999-07-01	7760
1999-10-01	7589
2000-01-01	6617
2000-04-01	6006
2000-07-01	5987
2000-10-01	5864
2001-01-01	7516
2001-04-01	6388
2001-07-01	7261
2001-10-01	6228
2002-01-01	6777
2002-04-01	7908
2002-07-01	8061
2002-10-01	7926
2003-01-01	7221
2003-04-01	5780
2003-07-01	5617
2003-10-01	6870
2004-01-01	5302
2004-04-01	5772
2004-07-01	5611
2004-10-01	6810
2005-01-01	7320
2005-04-01	5504
2005-07-01	7077
2005-10-01	5185
2006-01-01	4955
2006-04-01	4095
2006-07-01	3964
2006-10-01	3377
2007-01-01	3749
2007-04-01	3753
2007-07-01	7336
2007-10-01	10389
2008-01-01	10018
2008-04-01	9318
2008-07-01	8275
2008-10-01	5793
2009-01-01	3615
2009-04-01	3151
2009-07-01	2451
2009-10-01	1969
2010-01-01	2066
2010-04-01	2371
2010-07-01	2631
2010-10-01	2685
2011-01-01	2466
2011-04-01	2060
2011-07-01	3114
2011-10-01	3340
2012-01-01	3767
2012-04-01	3959
2012-07-01	3662
2012-10-01	3459
2013-01-01	3174
2013-04-01	2743
2013-07-01	2452
2013-10-01	2343
2014-01-01	2074
2014-04-01	1311
2014-07-01	971
2014-10-01	711
2015-01-01	972
2015-04-01	663
2015-07-01	412
2015-10-01	1165
2016-01-01	1285
2016-04-01	879
2016-07-01	655
2016-10-01	300
2017-01-01	384
2017-04-01	220
2017-07-01	265
2017-10-01	229
2018-01-01	175