Quarter	Millions of US Dollars
2004-10-01	104
2005-10-01	182
2006-10-01	379
2008-01-01	1328
2008-04-01	1257
2008-07-01	1175
2008-10-01	1094
2009-01-01	1047
2009-04-01	1087
2009-07-01	1135
2009-10-01	1046
2010-01-01	991
2010-04-01	887
2010-07-01	984
2010-10-01	957
2011-01-01	972
2011-04-01	991
2011-07-01	1238
2011-10-01	1190
2012-01-01	1210
2012-04-01	1507
2012-07-01	1544
2012-10-01	1528
2013-01-01	1483
2013-04-01	1664
2013-07-01	1712
2013-10-01	1771
2014-01-01	1893
2014-04-01	1874
2014-07-01	1719
2014-10-01	1655
2015-01-01	1418
2015-04-01	1521
2015-07-01	1589
2015-10-01	1546
2016-01-01	1627
2016-04-01	1583
2016-07-01	1589
2016-10-01	1505
2017-01-01	1531
2017-04-01	1714
2017-07-01	1825
2017-10-01	1895
2018-01-01	1967