Quarter	Millions of US Dollars
1989-01-01	311053
1989-04-01	325306
1989-07-01	336275
1989-10-01	349405
1990-01-01	348561
1990-04-01	359000
1990-07-01	373659
1990-10-01	382795
1991-01-01	395024
1991-04-01	413312
1991-07-01	429199
1991-10-01	423556
1992-01-01	418193
1992-04-01	431200
1992-07-01	421981
1992-10-01	417542
1993-01-01	431570
1993-04-01	435504
1993-07-01	422417
1993-10-01	429404
1994-01-01	417860
1994-04-01	427304
1994-07-01	444622
1994-10-01	424195
1995-01-01	428427
1995-04-01	446956
1995-07-01	464711
1995-10-01	459673
1996-01-01	464962
1996-04-01	465530
1996-07-01	465841
1996-10-01	458926
1997-01-01	458019
1997-04-01	454909
1997-07-01	450725
1997-10-01	438391
1998-01-01	441255
1998-04-01	426991
1998-07-01	402656
1998-10-01	397435
1999-01-01	414426
1999-04-01	424911
1999-07-01	428823
1999-10-01	439849
2000-01-01	438856
2000-04-01	434013
2000-07-01	422736
2000-10-01	423713
2001-01-01	406699
2001-04-01	419616
2001-07-01	407722
2001-10-01	407861
2002-01-01	411638
2002-04-01	443435
2002-07-01	422363
2002-10-01	422038
2003-01-01	456644
2003-04-01	497996
2003-07-01	502581
2003-10-01	529982
2004-01-01	526280
2004-04-01	514458
2004-07-01	543236
2004-10-01	574171
2005-01-01	582390
2005-04-01	571188
2005-07-01	602596
2005-10-01	605315
2006-01-01	615171
2006-04-01	638557
2006-07-01	639840
2006-10-01	619004
2007-01-01	633122
2007-04-01	678193
2007-07-01	720247
2007-10-01	738738
2008-01-01	712110
2008-04-01	736352
2008-07-01	721700
2008-10-01	670094
2009-01-01	693181
2009-04-01	770943
2009-07-01	860692
2009-10-01	896025
2010-01-01	946580
2010-04-01	933771
2010-07-01	970507
2010-10-01	1020744
2011-01-01	1065570
2011-04-01	1097715
2011-07-01	1029084
2011-10-01	1065847
2012-01-01	1105423
2012-04-01	1103631
2012-07-01	1170121
2012-10-01	1165460
2013-01-01	1164059
2013-04-01	1152922
2013-07-01	1193349
2013-10-01	1155714
2014-01-01	1091410
2014-04-01	1150613
2014-07-01	1105859
2014-10-01	1068913
2015-01-01	974818
2015-04-01	1021124
2015-07-01	959232
2015-10-01	937041
2016-01-01	1008987
2016-04-01	1028416
2016-07-01	1020838
2016-10-01	1009706
2017-01-01	1026743
2017-04-01	1088611
2017-07-01	1132105
2017-10-01	1123711
2018-01-01	1095130