Quarter	Millions of US Dollars
1998-10-01	275
1999-01-01	250
1999-04-01	242
1999-07-01	257
1999-10-01	231
2000-01-01	221
2000-04-01	217
2000-07-01	196
2000-10-01	203
2001-01-01	201
2001-04-01	191
2001-07-01	217
2001-10-01	251
2002-01-01	241
2002-04-01	264
2002-07-01	127
2002-10-01	134
2003-01-01	154
2003-04-01	155
2003-07-01	157
2003-10-01	167
2004-01-01	168
2004-04-01	161
2004-07-01	218
2004-10-01	323
2005-01-01	315
2005-04-01	424
2005-07-01	440
2005-10-01	528
2006-01-01	564
2006-04-01	586
2006-07-01	523
2006-10-01	544
2007-01-01	533
2007-04-01	539
2007-07-01	566
2007-10-01	634
2008-01-01	653
2008-04-01	638
2008-07-01	582
2008-10-01	560
2009-01-01	582
2009-04-01	618
2009-07-01	674
2009-10-01	1124
2010-01-01	1053
2010-04-01	958
2010-07-01	1052
2010-10-01	1031
2011-01-01	1099
2011-04-01	1148
2011-07-01	985
2011-10-01	990
2012-01-01	1030
2012-04-01	1036
2012-07-01	976
2012-10-01	985
2013-01-01	938
2013-04-01	1064
2013-07-01	1087
2013-10-01	1067
2014-01-01	1227
2014-04-01	1509
2014-07-01	1319
2014-10-01	1304
2015-01-01	1172
2015-04-01	1248
2015-07-01	1304
2015-10-01	1249
2016-01-01	1353
2016-04-01	1437
2016-07-01	1499
2016-10-01	976
2017-01-01	1074
2017-04-01	1163
2017-07-01	1207
2017-10-01	1185
2018-01-01	1242