Quarter	Millions of US Dollars
1999-10-01	164813
2000-01-01	155304
2000-04-01	154119
2000-07-01	142941
2000-10-01	163900
2001-01-01	151398
2001-04-01	147062
2001-07-01	162439
2001-10-01	181372
2002-01-01	159913
2002-04-01	186657
2002-07-01	195021
2002-10-01	262100
2003-01-01	264185
2003-04-01	277915
2003-07-01	284269
2003-10-01	343457
2004-01-01	306672
2004-04-01	310380
2004-07-01	315367
2004-10-01	434209
2005-01-01	379077
2005-04-01	364318
2005-07-01	374579
2005-10-01	441142
2006-01-01	380623
2006-04-01	401270
2006-07-01	416567
2006-10-01	515637
2007-01-01	458762
2007-04-01	473080
2007-07-01	524539
2007-10-01	641647
2008-01-01	654643
2008-04-01	602978
2008-07-01	564957
2008-10-01	659326
2009-01-01	576985
2009-04-01	637615
2009-07-01	687116
2009-10-01	782736
2010-01-01	637219
2010-04-01	599238
2010-07-01	658127
2010-10-01	747140
2011-01-01	671478
2011-04-01	665290
2011-07-01	651529
2011-10-01	709265
2012-01-01	619893
2012-04-01	607979
2012-07-01	651216
2012-10-01	725136
2013-01-01	650407
2013-04-01	616918
2013-07-01	664866
2013-10-01	712590
2014-01-01	687017
2014-04-01	638071
2014-07-01	627557
2014-10-01	638321
2015-01-01	561381
2015-04-01	557022
2015-07-01	555513
2015-10-01	551256
2016-01-01	572166
2016-04-01	559690
2016-07-01	578245
2016-10-01	557119
2017-01-01	561516
2017-04-01	586103
2017-07-01	611981
2017-10-01	634569
2018-01-01	638409