Quarter	Millions of US Dollars
1989-01-01	216471
1989-04-01	220530
1989-07-01	228069
1989-10-01	235601
1990-01-01	237948
1990-04-01	242668
1990-07-01	250658
1990-10-01	255527
1991-01-01	266281
1991-04-01	276615
1991-07-01	287732
1991-10-01	286161
1992-01-01	281809
1992-04-01	287657
1992-07-01	283759
1992-10-01	281299
1993-01-01	293447
1993-04-01	292422
1993-07-01	288213
1993-10-01	295915
1994-01-01	288086
1994-04-01	295844
1994-07-01	311868
1994-10-01	300952
1995-01-01	303029
1995-04-01	314842
1995-07-01	330151
1995-10-01	332865
1996-01-01	334386
1996-04-01	338702
1996-07-01	344435
1996-10-01	351218
1997-01-01	351261
1997-04-01	358004
1997-07-01	358697
1997-10-01	353893
1998-01-01	353777
1998-04-01	352978
1998-07-01	337550
1998-10-01	333609
1999-01-01	342648
1999-04-01	359440
1999-07-01	356025
1999-10-01	366187
2000-01-01	361439
2000-04-01	365204
2000-07-01	360768
2000-10-01	362992
2001-01-01	342423
2001-04-01	356326
2001-07-01	344611
2001-10-01	339654
2002-01-01	344252
2002-04-01	363634
2002-07-01	347274
2002-10-01	346493
2003-01-01	375460
2003-04-01	405906
2003-07-01	409052
2003-10-01	427497
2004-01-01	431356
2004-04-01	416603
2004-07-01	440802
2004-10-01	464768
2005-01-01	468840
2005-04-01	462196
2005-07-01	488897
2005-10-01	485909
2006-01-01	491015
2006-04-01	513459
2006-07-01	518358
2006-10-01	499496
2007-01-01	504261
2007-04-01	551989
2007-07-01	591670
2007-10-01	604655
2008-01-01	584240
2008-04-01	592695
2008-07-01	574024
2008-10-01	504686
2009-01-01	522141
2009-04-01	585988
2009-07-01	657144
2009-10-01	693335
2010-01-01	745928
2010-04-01	747378
2010-07-01	775965
2010-10-01	817054
2011-01-01	868377
2011-04-01	893928
2011-07-01	835818
2011-10-01	875957
2012-01-01	914821
2012-04-01	905459
2012-07-01	955499
2012-10-01	954981
2013-01-01	958452
2013-04-01	940814
2013-07-01	973185
2013-10-01	962766
2014-01-01	925703
2014-04-01	969718
2014-07-01	939398
2014-10-01	911164
2015-01-01	841589
2015-04-01	875202
2015-07-01	820326
2015-10-01	802693
2016-01-01	875821
2016-04-01	882264
2016-07-01	881330
2016-10-01	881664
2017-01-01	898537
2017-04-01	942946
2017-07-01	993867
2017-10-01	997950
2018-01-01	979521