Quarter	Millions of US Dollars
1989-01-01	371741
1989-04-01	384368
1989-07-01	395120
1989-10-01	409023
1990-01-01	408852
1990-04-01	421486
1990-07-01	437957
1990-10-01	449548
1991-01-01	465312
1991-04-01	487377
1991-07-01	505586
1991-10-01	503400
1992-01-01	499035
1992-04-01	518180
1992-07-01	509400
1992-10-01	505510
1993-01-01	531708
1993-04-01	537827
1993-07-01	529454
1993-10-01	537854
1994-01-01	532205
1994-04-01	547482
1994-07-01	572154
1994-10-01	548400
1995-01-01	562695
1995-04-01	580542
1995-07-01	599232
1995-10-01	592500
1996-01-01	601332
1996-04-01	601016
1996-07-01	602242
1996-10-01	595831
1997-01-01	595084
1997-04-01	592937
1997-07-01	587494
1997-10-01	568893
1998-01-01	573827
1998-04-01	557885
1998-07-01	539167
1998-10-01	537651
1999-01-01	550554
1999-04-01	556762
1999-07-01	560910
1999-10-01	570592
2000-01-01	568826
2000-04-01	559251
2000-07-01	542845
2000-10-01	543172
2001-01-01	521416
2001-04-01	533737
2001-07-01	520682
2001-10-01	519243
2002-01-01	520143
2002-04-01	554293
2002-07-01	530174
2002-10-01	533053
2003-01-01	561865
2003-04-01	608154
2003-07-01	612840
2003-10-01	643064
2004-01-01	635990
2004-04-01	620239
2004-07-01	649653
2004-10-01	682503
2005-01-01	691810
2005-04-01	677120
2005-07-01	705397
2005-10-01	709901
2006-01-01	718259
2006-04-01	741791
2006-07-01	740596
2006-10-01	720799
2007-01-01	735572
2007-04-01	782474
2007-07-01	822924
2007-10-01	841489
2008-01-01	813204
2008-04-01	841679
2008-07-01	822641
2008-10-01	767587
2009-01-01	792501
2009-04-01	889173
2009-07-01	970083
2009-10-01	1012009
2010-01-01	1063389
2010-04-01	1057734
2010-07-01	1094808
2010-10-01	1149517
2011-01-01	1198985
2011-04-01	1237470
2011-07-01	1170959
2011-10-01	1206020
2012-01-01	1247404
2012-04-01	1254851
2012-07-01	1323744
2012-10-01	1314852
2013-01-01	1307480
2013-04-01	1301020
2013-07-01	1341345
2013-10-01	1302562
2014-01-01	1236952
2014-04-01	1300418
2014-07-01	1253814
2014-10-01	1210649
2015-01-01	1111090
2015-04-01	1164293
2015-07-01	1094250
2015-10-01	1070577
2016-01-01	1144051
2016-04-01	1163356
2016-07-01	1151976
2016-10-01	1137452
2017-01-01	1151163
2017-04-01	1221214
2017-07-01	1275583
2017-10-01	1264185
2018-01-01	1234679