Quarter	Millions of US Dollars
2001-01-01	0
2001-04-01	0
2001-07-01	0
2001-10-01	0
2002-01-01	0
2002-04-01	0
2002-07-01	0
2002-10-01	0
2003-01-01	0
2003-04-01	0
2003-07-01	129
2003-10-01	182
2004-01-01	236
2004-04-01	239
2004-07-01	233
2004-10-01	213
2005-01-01	216
2005-04-01	203
2005-07-01	188
2005-10-01	221
2006-01-01	387
2006-04-01	381
2006-07-01	334
2006-10-01	650
2007-01-01	510
2007-04-01	676
2007-07-01	437
2007-10-01	366
2008-01-01	414
2008-04-01	285
2008-07-01	1746
2008-10-01	2051
2009-01-01	1919
2009-04-01	2356
2009-07-01	2320
2009-10-01	2653
2010-01-01	2227
2010-04-01	1847
2010-07-01	2243
2010-10-01	2386
2011-01-01	1873
2011-04-01	1783
2011-07-01	1247
2011-10-01	1255
2012-01-01	1349
2012-04-01	1428
2012-07-01	1485
2012-10-01	1590
2013-01-01	1380
2013-04-01	1142
2013-07-01	1076
2013-10-01	1013
2014-01-01	982
2014-04-01	900
2014-07-01	845
2014-10-01	741
2015-01-01	755
2015-04-01	876
2015-07-01	610
2015-10-01	546
2016-01-01	493
2016-04-01	340
2016-07-01	476
2016-10-01	363
2017-01-01	446
2017-04-01	484
2017-07-01	471
2017-10-01	582
2018-01-01	605