Quarter	Millions of US Dollars
2005-01-01	840
2005-04-01	1265
2005-07-01	1250
2005-10-01	1246
2006-01-01	1246
2006-04-01	1249
2006-07-01	1239
2006-10-01	1295
2007-01-01	1313
2007-04-01	1292
2007-07-01	1309
2007-10-01	1349
2008-01-01	1419
2008-04-01	1389
2008-07-01	1319
2008-10-01	1315
2009-01-01	1245
2009-04-01	1292
2009-07-01	1312
2009-10-01	1326
2010-01-01	1392
2010-04-01	1402
2010-07-01	1472
2010-10-01	1540
2011-01-01	1501
2011-04-01	1504
2011-07-01	1422
2011-10-01	1361
2012-01-01	1410
2012-04-01	1361
2012-07-01	1411
2012-10-01	1413
2013-01-01	1395
2013-04-01	1367
2013-07-01	1323
2013-10-01	1319
2014-01-01	1324
2014-04-01	1345
2014-07-01	1316
2014-10-01	1235
2015-01-01	1705
2015-04-01	1549
2015-07-01	1911
2015-10-01	1113
2016-01-01	1576
2016-04-01	1165
2016-07-01	1137
2016-10-01	1048
2017-01-01	2192
2017-04-01	2260
2017-07-01	1564
2017-10-01	1137
2018-01-01	2740