Quarter	Millions of US Dollars
1989-01-01	89233
1989-04-01	90281
1989-07-01	94100
1989-10-01	97884
1990-01-01	97833
1990-04-01	101531
1990-07-01	103689
1990-10-01	99891
1991-01-01	97155
1991-04-01	93825
1991-07-01	95463
1991-10-01	91583
1992-01-01	80107
1992-04-01	82483
1992-07-01	78740
1992-10-01	69442
1993-01-01	68950
1993-04-01	72070
1993-07-01	73054
1993-10-01	75483
1994-01-01	73107
1994-04-01	74137
1994-07-01	76998
1994-10-01	73287
1995-01-01	78534
1995-04-01	82156
1995-07-01	85393
1995-10-01	86023
1996-01-01	89095
1996-04-01	92681
1996-07-01	96121
1996-10-01	99359
1997-01-01	107889
1997-04-01	116612
1997-07-01	123853
1997-10-01	128377
1998-01-01	139230
1998-04-01	150291
1998-07-01	151312
1998-10-01	152560
1999-01-01	167429
1999-04-01	177781
1999-07-01	180974
1999-10-01	189004
2000-01-01	197600
2000-04-01	197329
2000-07-01	195895
2000-10-01	198830
2001-01-01	192050
2001-04-01	196086
2001-07-01	193104
2001-10-01	197852
2002-01-01	197745
2002-04-01	206566
2002-07-01	199185
2002-10-01	199149
2003-01-01	213554
2003-04-01	227509
2003-07-01	234330
2003-10-01	247105
2004-01-01	245050
2004-04-01	245723
2004-07-01	262092
2004-10-01	283214
2005-01-01	288678
2005-04-01	290044
2005-07-01	311430
2005-10-01	324882
2006-01-01	347596
2006-04-01	369133
2006-07-01	378127
2006-10-01	386457
2007-01-01	398492
2007-04-01	448092
2007-07-01	450044
2007-10-01	450436
2008-01-01	447761
2008-04-01	445392
2008-07-01	428813
2008-10-01	364752
2009-01-01	348185
2009-04-01	364191
2009-07-01	373040
2009-10-01	364862
2010-01-01	371537
2010-04-01	366441
2010-07-01	367652
2010-10-01	383257
2011-01-01	402370
2011-04-01	405638
2011-07-01	395659
2011-10-01	406624
2012-01-01	448336
2012-04-01	439776
2012-07-01	459047
2012-10-01	465685
2013-01-01	469739
2013-04-01	473182
2013-07-01	517166
2013-10-01	528231
2014-01-01	538092
2014-04-01	568190
2014-07-01	574150
2014-10-01	558953
2015-01-01	543640
2015-04-01	567616
2015-07-01	554001
2015-10-01	549027
2016-01-01	594771
2016-04-01	617368
2016-07-01	628874
2016-10-01	602564
2017-01-01	605122
2017-04-01	627562
2017-07-01	652464
2017-10-01	656878
2018-01-01	659278