Quarter	Millions of US Dollars
1997-10-01	227620
1998-01-01	280576
1998-04-01	274806
1998-07-01	215516
1998-10-01	290721
1999-01-01	250282
1999-04-01	385964
1999-07-01	386466
1999-10-01	375036
2000-01-01	428474
2000-04-01	474103
2000-07-01	405935
2000-10-01	349826
2001-01-01	379940
2001-04-01	409487
2001-07-01	367109
2001-10-01	325010
2002-01-01	374634
2002-04-01	479872
2002-07-01	396823
2002-10-01	366955
2003-01-01	484838
2003-04-01	566390
2003-07-01	607955
2003-10-01	657782
2004-01-01	829175
2004-04-01	917048
2004-07-01	785118
2004-10-01	837815
2005-01-01	899691
2005-04-01	877173
2005-07-01	804619
2005-10-01	764888
2006-01-01	829716
2006-04-01	876146
2006-07-01	802731
2006-10-01	809611
2007-01-01	854801
2007-04-01	872500
2007-07-01	885193
2007-10-01	913330
2008-01-01	1082663
2008-04-01	1010978
2008-07-01	1016996
2008-10-01	1201247
2009-01-01	1177724
2009-04-01	1421999
2009-07-01	1550281
2009-10-01	1558913
2010-01-01	1601811
2010-04-01	1785382
2010-07-01	1819284
2010-10-01	1846271
2011-01-01	1813136
2011-04-01	2023924
2011-07-01	2219414
2011-10-01	2113901
2012-01-01	1934395
2012-04-01	2102766
2012-07-01	2168304
2012-10-01	2037747
2013-01-01	1716027
2013-04-01	1713691
2013-07-01	1662095
2013-10-01	1509345
2014-01-01	1523784
2014-04-01	1585113
2014-07-01	1407055
2014-10-01	1153397
2015-01-01	1290655
2015-04-01	1240985
2015-07-01	1176332
2015-10-01	1033451
2016-01-01	1067670
2016-04-01	1148764
2016-07-01	1183228
2016-10-01	1003071
2017-01-01	1030318
2017-04-01	1000443
2017-07-01	964740
2017-10-01	925461
2018-01-01	953880