Quarter	Millions of US Dollars
1989-10-01	58591
1990-01-01	62137
1990-04-01	65900
1990-07-01	72864
1990-10-01	80267
1991-01-01	72252
1991-04-01	69776
1991-07-01	77470
1991-10-01	88359
1992-01-01	85957
1992-04-01	96847
1992-07-01	109622
1992-10-01	102111
1993-01-01	101636
1993-04-01	96375
1993-07-01	94317
1993-10-01	92185
1994-01-01	95853
1994-04-01	104554
1994-07-01	113627
1994-10-01	126495
1995-01-01	141727
1995-04-01	141688
1995-07-01	137866
1995-10-01	137574
1996-01-01	134304
1996-04-01	131026
1996-07-01	130189
1996-10-01	136196
1997-01-01	123770
1997-04-01	119161
1997-07-01	114382
1997-10-01	110612
1998-01-01	105313
1998-04-01	105179
1998-07-01	111756
1998-10-01	105414
1999-01-01	96532
1999-04-01	91830
1999-07-01	92100
1999-10-01	90727
2000-01-01	85561
2000-04-01	87512
2000-07-01	79228
2000-10-01	87997
2001-01-01	79155
2001-04-01	73527
2001-07-01	79364
2001-10-01	75682
2002-01-01	74385
2002-04-01	85227
2002-07-01	84041
2002-10-01	88007
2003-01-01	88051
2003-04-01	87543
2003-07-01	87361
2003-10-01	95017
2004-01-01	87852
2004-04-01	85375
2004-07-01	85695
2004-10-01	96072
2005-01-01	84197
2005-04-01	76016
2005-07-01	73081
2005-10-01	73060
2006-01-01	75293
2006-04-01	78633
2006-07-01	79698
2006-10-01	83586
2007-01-01	89361
2007-04-01	90637
2007-07-01	106705
2007-10-01	119051
2008-01-01	134319
2008-04-01	170809
2008-07-01	154853
2008-10-01	175055
2009-01-01	176786
2009-04-01	209497
2009-07-01	239945
2009-10-01	251143
2010-01-01	227642
2010-04-01	206707
2010-07-01	236602
2010-10-01	220243
2011-01-01	240707
2011-04-01	241211
2011-07-01	219375
2011-10-01	224707
2012-01-01	235673
2012-04-01	225419
2012-07-01	220166
2012-10-01	223867
2013-01-01	216545
2013-04-01	219878
2013-07-01	230289
2013-10-01	230347
2014-01-01	234276
2014-04-01	227509
2014-07-01	208339
2014-10-01	198716
2015-01-01	178374
2015-04-01	181485
2015-07-01	181899
2015-10-01	176426
2016-01-01	185364
2016-04-01	183454
2016-07-01	180419
2016-10-01	183292
2017-01-01	192121
2017-04-01	213564
2017-07-01	219638
2017-10-01	215071
2018-01-01	206758