Quarter	Millions of US Dollars
1997-10-01	5204284
1998-01-01	5219633
1998-04-01	5024698
1998-07-01	5295172
1998-10-01	6091893
1999-01-01	6006968
1999-04-01	6040528
1999-07-01	6966014
1999-10-01	7300726
2000-01-01	7263314
2000-04-01	7171484
2000-07-01	6925996
2000-10-01	6676764
2001-01-01	6358158
2001-04-01	6588231
2001-07-01	6853619
2001-10-01	6300982
2002-01-01	6349817
2002-04-01	7295190
2002-07-01	7165078
2002-10-01	7438298
2003-01-01	7700687
2003-04-01	7735923
2003-07-01	8296981
2003-10-01	8729560
2004-01-01	9279516
2004-04-01	9016500
2004-07-01	8991954
2004-10-01	9896128
2005-01-01	9808001
2005-04-01	9648833
2005-07-01	9392906
2005-10-01	9162141
2006-01-01	9136679
2006-04-01	9303976
2006-07-01	9154024
2006-10-01	9090342
2007-01-01	9184368
2007-04-01	8774079
2007-07-01	9429959
2007-10-01	9852101
2008-01-01	11224331
2008-04-01	10463118
2008-07-01	10473015
2008-10-01	12329938
2009-01-01	11193376
2009-04-01	11661812
2009-07-01	12549218
2009-10-01	12268507
2010-01-01	12179000
2010-04-01	13266468
2010-07-01	14242753
2010-10-01	14604136
2011-01-01	14253093
2011-04-01	14988690
2011-07-01	15910689
2011-10-01	15809098
2012-01-01	14898301
2012-04-01	15647616
2012-07-01	16141190
2012-10-01	14719010
2013-01-01	13494548
2013-04-01	12892954
2013-07-01	13179878
2013-10-01	12349489
2014-01-01	12603957
2014-04-01	13009195
2014-07-01	12054399
2014-10-01	11178534
2015-01-01	11273194
2015-04-01	11039229
2015-07-01	11257494
2015-10-01	11239693
2016-01-01	12491826
2016-04-01	13910464
2016-07-01	13977935
2016-10-01	12030742
2017-01-01	12581255
2017-04-01	12601125
2017-07-01	12600573
2017-10-01	12693653
2018-01-01	13447376