Quarter	Millions of US Dollars
2005-04-01	23
2005-07-01	77
2005-10-01	711
2006-01-01	789
2006-04-01	907
2006-07-01	993
2006-10-01	1141
2007-01-01	1242
2007-04-01	1338
2007-07-01	1405
2007-10-01	1459
2008-01-01	1575
2008-04-01	1567
2008-07-01	1424
2008-10-01	1395
2009-01-01	1331
2009-04-01	1412
2009-07-01	1465
2009-10-01	1444
2010-01-01	1356
2010-04-01	1246
2010-07-01	1385
2010-10-01	1366
2011-01-01	1466
2011-04-01	1505
2011-07-01	3409
2011-10-01	4018
2012-01-01	9127
2012-04-01	10136
2012-07-01	12776
2012-10-01	13522
2013-01-01	15406
2013-04-01	15694
2013-07-01	14332
2013-10-01	13447
2014-01-01	10747
2014-04-01	10233
2014-07-01	9591
2014-10-01	9232
2015-01-01	8768
2015-04-01	8528
2015-07-01	8067
2015-10-01	7730
2016-01-01	7664
2016-04-01	7559
2016-07-01	7330
2016-10-01	7130
2017-01-01	7012
2017-04-01	3500
2017-07-01	3367
2017-10-01	3246
2018-01-01	3002
2018-04-01	2813