Quarter	Millions of US Dollars
2002-01-01	420747
2002-04-01	367619
2002-07-01	281606
2002-10-01	307444
2003-01-01	337829
2003-04-01	402646
2003-07-01	415489
2003-10-01	411858
2004-01-01	430124
2004-04-01	407477
2004-07-01	452885
2004-10-01	505768
2005-01-01	533397
2005-04-01	633539
2005-07-01	697148
2005-10-01	684844
2006-01-01	767850
2006-04-01	772233
2006-07-01	811843
2006-10-01	855761
2007-01-01	931943
2007-04-01	1029229
2007-07-01	1098534
2007-10-01	1198322
2008-01-01	1259837
2008-04-01	1472583
2008-07-01	1261023
2008-10-01	1119794
2009-01-01	1128515
2009-04-01	1387558
2009-07-01	1566161
2009-10-01	1672600
2010-01-01	1664641
2010-04-01	1742601
2010-07-01	1891505
2010-10-01	2037767
2011-01-01	2147420
2011-04-01	2363548
2011-07-01	2033636
2011-10-01	2107915
2012-01-01	2208383
2012-04-01	2055540
2012-07-01	2067020
2012-10-01	2125480
2013-01-01	2155654
2013-04-01	2000248
2013-07-01	1985231
2013-10-01	1983520
2014-01-01	2085933
2014-04-01	2257679
2014-07-01	2023658
2014-10-01	1979308
2015-01-01	1674513
2015-04-01	1806389
2015-07-01	1465909
2015-10-01	1537799
2016-01-01	1723705
2016-04-01	1968457
2016-07-01	1996340
2016-10-01	2074347
2017-01-01	2185915
2017-04-01	2122680
2017-07-01	2233498
2017-10-01	2183674
2018-01-01	2210725