Quarter	Millions of US Dollars
2005-01-01	521
2005-04-01	1753
2005-07-01	1842
2005-10-01	2015
2006-01-01	2625
2006-04-01	2889
2006-07-01	2911
2006-10-01	3073
2007-01-01	3325
2007-04-01	3880
2007-07-01	4022
2007-10-01	4055
2008-01-01	4360
2008-04-01	4228
2008-07-01	4118
2008-10-01	4192
2009-01-01	2971
2009-04-01	2502
2009-07-01	5199
2009-10-01	5055
2010-01-01	4731
2010-04-01	7145
2010-07-01	8775
2010-10-01	12079
2011-01-01	9200
2011-04-01	8877
2011-07-01	10683
2011-10-01	11116
2012-01-01	17250
2012-04-01	17644
2012-07-01	21609
2012-10-01	21469
2013-01-01	20271
2013-04-01	16867
2013-07-01	13480
2013-10-01	13644
2014-01-01	13998
2014-04-01	12378
2014-07-01	11097
2014-10-01	2908
2015-01-01	1655
2015-04-01	1648
2015-07-01	1041
2015-10-01	1348
2016-01-01	1378
2016-04-01	1188
2016-07-01	1261
2016-10-01	1176
2017-01-01	1202
2017-04-01	1591
2017-07-01	1655
2017-10-01	2589
2018-01-01	3145