Quarter	Millions of US Dollars
1997-10-01	2837582
1998-01-01	2903778
1998-04-01	2836573
1998-07-01	2982884
1998-10-01	3537923
1999-01-01	3539446
1999-04-01	3656683
1999-07-01	4237758
1999-10-01	4431152
2000-01-01	4517175
2000-04-01	4540828
2000-07-01	4413095
2000-10-01	4264069
2001-01-01	4109968
2001-04-01	4224177
2001-07-01	4335369
2001-10-01	3967409
2002-01-01	4011987
2002-04-01	4637130
2002-07-01	4533661
2002-10-01	4651517
2003-01-01	4840035
2003-04-01	4895659
2003-07-01	5259830
2003-10-01	5554845
2004-01-01	5954024
2004-04-01	5837252
2004-07-01	5779884
2004-10-01	6335081
2005-01-01	6290267
2005-04-01	6211023
2005-07-01	6014936
2005-10-01	5826993
2006-01-01	5819045
2006-04-01	5958192
2006-07-01	5864501
2006-10-01	5830118
2007-01-01	5900642
2007-04-01	5611025
2007-07-01	6054032
2007-10-01	6312995
2008-01-01	7280887
2008-04-01	6804246
2008-07-01	6830613
2008-10-01	8122615
2009-01-01	7417492
2009-04-01	7832446
2009-07-01	8459006
2009-10-01	8312587
2010-01-01	8334217
2010-04-01	9150284
2010-07-01	9869691
2010-10-01	10171084
2011-01-01	10024526
2011-04-01	10657252
2011-07-01	11432307
2011-10-01	11359734
2012-01-01	10733387
2012-04-01	11349262
2012-07-01	11775188
2012-10-01	10690616
2013-01-01	9866187
2013-04-01	9469312
2013-07-01	9722625
2013-10-01	9120011
2014-01-01	9348426
2014-04-01	9701821
2014-07-01	8988193
2014-10-01	8318486
2015-01-01	8430537
2015-04-01	8286455
2015-07-01	8456968
2015-10-01	8411926
2016-01-01	9307615
2016-04-01	10484316
2016-07-01	10543761
2016-10-01	9005819
2017-01-01	9405981
2017-04-01	9424332
2017-07-01	9432425
2017-10-01	9470916
2018-01-01	10042395