Quarter	Millions of US Dollars
2004-01-01	7009
2004-04-01	7523
2004-07-01	8027
2004-10-01	8736
2005-01-01	8542
2005-04-01	8417
2005-07-01	8580
2005-10-01	8305
2006-01-01	9290
2006-04-01	9148
2006-07-01	8954
2006-10-01	8974
2007-01-01	9505
2007-04-01	9187
2007-07-01	9328
2007-10-01	9530
2008-01-01	9046
2008-04-01	8318
2008-07-01	7380
2008-10-01	7152
2009-01-01	8181
2009-04-01	12254
2009-07-01	12434
2009-10-01	9594
2010-01-01	10171
2010-04-01	9450
2010-07-01	9980
2010-10-01	10468
2011-01-01	11791
2011-04-01	12880
2011-07-01	12094
2011-10-01	11978
2012-01-01	10510
2012-04-01	11731
2012-07-01	12100
2012-10-01	12718
2013-01-01	12319
2013-04-01	10518
2013-07-01	10979
2013-10-01	11081
2014-01-01	10793
2014-04-01	11902
2014-07-01	8979
2014-10-01	8668
2015-01-01	7514
2015-04-01	8119
2015-07-01	7856
2015-10-01	6652
2016-01-01	6974
2016-04-01	6796
2016-07-01	7945
2016-10-01	7141
2017-01-01	7387
2017-04-01	8133
2017-07-01	8409
2017-10-01	8459
2018-01-01	8718