Quarter	Millions of US Dollars
1997-10-01	1134381
1998-01-01	1089344
1998-04-01	1052145
1998-07-01	1109612
1998-10-01	1186109
1999-01-01	1102520
1999-04-01	1061901
1999-07-01	1202740
1999-10-01	1279756
2000-01-01	1193862
2000-04-01	1171528
2000-07-01	1102331
2000-10-01	1072476
2001-01-01	991091
2001-04-01	1018081
2001-07-01	1026077
2001-10-01	912382
2002-01-01	867352
2002-04-01	978939
2002-07-01	937677
2002-10-01	974763
2003-01-01	942603
2003-04-01	919095
2003-07-01	946114
2003-10-01	986356
2004-01-01	1002440
2004-04-01	958074
2004-07-01	931450
2004-10-01	1012255
2005-01-01	942771
2005-04-01	926434
2005-07-01	895217
2005-10-01	673103
2006-01-01	620885
2006-04-01	641276
2006-07-01	634011
2006-10-01	644028
2007-01-01	634579
2007-04-01	633032
2007-07-01	685323
2007-10-01	762141
2008-01-01	826898
2008-04-01	798128
2008-07-01	796922
2008-10-01	924478
2009-01-01	824071
2009-04-01	861809
2009-07-01	895015
2009-10-01	882324
2010-01-01	825254
2010-04-01	898105
2010-07-01	945833
2010-10-01	979934
2011-01-01	920989
2011-04-01	951928
2011-07-01	985575
2011-10-01	980322
2012-01-01	896145
2012-04-01	930512
2012-07-01	948173
2012-10-01	867167
2013-01-01	762976
2013-04-01	740515
2013-07-01	752445
2013-10-01	713841
2014-01-01	697261
2014-04-01	727209
2014-07-01	674962
2014-10-01	637014
2015-01-01	612806
2015-04-01	595915
2015-07-01	601649
2015-10-01	609789
2016-01-01	639467
2016-04-01	744881
2016-07-01	752389
2016-10-01	674222
2017-01-01	687357
2017-04-01	711260
2017-07-01	710813
2017-10-01	741518
2018-01-01	764688