Quarter	Millions of US Dollars
2009-10-01	1390678
2010-01-01	1304607
2010-04-01	1208713
2010-07-01	1305237
2010-10-01	1303632
2011-01-01	1356372
2011-04-01	1358773
2011-07-01	1257708
2011-10-01	1214172
2012-01-01	1234201
2012-04-01	1170431
2012-07-01	1191259
2012-10-01	1209030
2013-01-01	1178241
2013-04-01	1189015
2013-07-01	1186259
2013-10-01	1195627
2014-01-01	1181780
2014-04-01	1179554
2014-07-01	1095873
2014-10-01	1038053
2015-01-01	938460
2015-04-01	975226
2015-07-01	877014
2015-10-01	883490
2016-01-01	881221
2016-04-01	831790
2016-07-01	823155
2016-10-01	764913
2017-01-01	767890
2017-04-01	830485
2017-07-01	851641
2017-10-01	863123
2018-01-01	864806