Quarter	Millions of US Dollars
2000-01-01	74986
2000-04-01	81511
2000-07-01	86341
2000-10-01	88215
2001-01-01	91018
2001-04-01	92532
2001-07-01	97479
2001-10-01	101711
2002-01-01	103100
2002-04-01	105603
2002-07-01	134361
2002-10-01	137280
2003-01-01	127524
2003-04-01	153905
2003-07-01	189628
2003-10-01	183237
2004-01-01	219937
2004-04-01	250605
2004-07-01	257959
2004-10-01	316732
2005-01-01	374330
2005-04-01	426627
2005-07-01	463513
2005-10-01	524328
2006-01-01	626124
2006-04-01	658618
2006-07-01	706161
2006-10-01	739101
2007-01-01	872598
2007-04-01	895606
2007-07-01	942233
2007-10-01	942713
2008-01-01	1099850
2008-04-01	1178871
2008-07-01	1264094
2008-10-01	1305574
2009-01-01	1250819
2009-04-01	1249145
2009-07-01	1280071
2009-10-01	1366316
2010-01-01	1413885
2010-04-01	1505446
2010-07-01	1536989
2010-10-01	1518634
2011-01-01	1472346
2011-04-01	1492146
2011-07-01	1477528
2011-10-01	1537966
2012-01-01	1587786
2012-04-01	1599739
2012-07-01	1671026
2012-10-01	1713190
2013-01-01	1787478
2013-04-01	1765136
2013-07-01	1771766
2013-10-01	1836488
2014-01-01	1896682
2014-04-01	1956070
2014-07-01	2047720
2014-10-01	2089780
2015-01-01	2319207
2015-04-01	2523918
2015-07-01	2778206
2015-10-01	2911388
2016-01-01	3132748
2016-04-01	3249437
2016-07-01	3397968
2016-10-01	3405555
2017-01-01	3713850
2017-04-01	3846856
2017-07-01	4101187
2017-10-01	4276625
2018-01-01	4566661