Quarter	Millions of US Dollars
1989-10-01	102251
1990-01-01	104465
1990-04-01	107663
1990-07-01	113575
1990-10-01	120260
1991-01-01	108701
1991-04-01	106037
1991-07-01	118165
1991-10-01	133156
1992-01-01	128084
1992-04-01	141699
1992-07-01	131448
1992-10-01	112741
1993-01-01	106450
1993-04-01	114096
1993-07-01	114282
1993-10-01	113380
1994-01-01	126582
1994-04-01	133295
1994-07-01	136960
1994-10-01	132810
1995-01-01	125941
1995-04-01	130786
1995-07-01	133020
1995-10-01	135861
1996-01-01	140654
1996-04-01	147291
1996-07-01	161335
1996-10-01	187479
1997-01-01	187797
1997-04-01	200749
1997-07-01	213599
1997-10-01	225397
1998-01-01	229964
1998-04-01	257128
1998-07-01	283014
1998-10-01	293630
1999-01-01	277248
1999-04-01	274762
1999-07-01	287890
1999-10-01	283843
2000-01-01	283214
2000-04-01	290205
2000-07-01	275282
2000-10-01	305304
2001-01-01	301113
2001-04-01	304168
2001-07-01	338671
2001-10-01	348346
2002-01-01	355112
2002-04-01	425969
2002-07-01	429872
2002-10-01	476311
2003-01-01	511384
2003-04-01	552548
2003-07-01	569017
2003-10-01	644190
2004-01-01	638089
2004-04-01	653475
2004-07-01	677963
2004-10-01	772088
2005-01-01	752207
2005-04-01	733513
2005-07-01	727926
2005-10-01	750456
2006-01-01	795040
2006-04-01	851617
2006-07-01	859626
2006-10-01	930751
2007-01-01	972066
2007-04-01	1019797
2007-07-01	1067113
2007-10-01	1155735
2008-01-01	1297170
2008-04-01	1385691
2008-07-01	1289839
2008-10-01	1359691
2009-01-01	1375636
2009-04-01	1489885
2009-07-01	1585079
2009-10-01	1583410
2010-01-01	1461447
2010-04-01	1311918
2010-07-01	1452960
2010-10-01	1403277
2011-01-01	1512100
2011-04-01	1538092
2011-07-01	1451745
2011-10-01	1491987
2012-01-01	1591276
2012-04-01	1477579
2012-07-01	1536307
2012-10-01	1574558
2013-01-01	1486336
2013-04-01	1494540
2013-07-01	1509398
2013-10-01	1511697
2014-01-01	1432538
2014-04-01	1384869
2014-07-01	1221004
2014-10-01	1127409
2015-01-01	950421
2015-04-01	950721
2015-07-01	920999
2015-10-01	881096
2016-01-01	874233
2016-04-01	849525
2016-07-01	842722
2016-10-01	783981
2017-01-01	781560
2017-04-01	811301
2017-07-01	825980
2017-10-01	834014
2018-01-01	823768