Quarter	Millions of US Dollars
2008-01-01	23222
2008-04-01	20361
2008-07-01	20386
2008-10-01	17692
2009-01-01	20987
2009-04-01	24793
2009-07-01	25876
2009-10-01	27507
2010-01-01	26922
2010-04-01	27103
2010-07-01	31123
2010-10-01	31988
2011-01-01	32357
2011-04-01	33839
2011-07-01	31630
2011-10-01	31911
2012-01-01	34647
2012-04-01	33929
2012-07-01	39105
2012-10-01	36429
2013-01-01	36106
2013-04-01	32439
2013-07-01	32303
2013-10-01	30715
2014-01-01	29736
2014-04-01	31530
2014-07-01	29032
2014-10-01	28147
2015-01-01	29376
2015-04-01	26363
2015-07-01	22572
2015-10-01	21423
2016-01-01	24515
2016-04-01	25885
2016-07-01	27784