Quarter	Millions of US Dollars
1989-10-01	19738
1990-01-01	21181
1990-04-01	22054
1990-07-01	24379
1990-10-01	28395
1991-01-01	25698
1991-04-01	24304
1991-07-01	27310
1991-10-01	30800
1992-01-01	29823
1992-04-01	33321
1992-07-01	37632
1992-10-01	32781
1993-01-01	34477
1993-04-01	32050
1993-07-01	34419
1993-10-01	34178
1994-01-01	37482
1994-04-01	39522
1994-07-01	40659
1994-10-01	41160
1995-01-01	47082
1995-04-01	47074
1995-07-01	48231
1995-10-01	47478
1996-01-01	47722
1996-04-01	48397
1996-07-01	48640
1996-10-01	50125
1997-01-01	48882
1997-04-01	48366
1997-07-01	49686
1997-10-01	47682
1998-01-01	50853
1998-04-01	47423
1998-07-01	49319
1998-10-01	53726
1999-01-01	50339
1999-04-01	50649
1999-07-01	54364
1999-10-01	55935
2000-01-01	50902
2000-04-01	52850
2000-07-01	55730
2000-10-01	61969
2001-01-01	64187
2001-04-01	64930
2001-07-01	69553
2001-10-01	70369
2002-01-01	72166
2002-04-01	80291
2002-07-01	75291
2002-10-01	82677
2003-01-01	84249
2003-04-01	82847
2003-07-01	84917
2003-10-01	93962
2004-01-01	85912
2004-04-01	87489
2004-07-01	90138
2004-10-01	104771
2005-01-01	106631
2005-04-01	103000
2005-07-01	104105
2005-10-01	105622
2006-01-01	104331
2006-04-01	109361
2006-07-01	111630
2006-10-01	118587
2007-01-01	120325
2007-04-01	123252
2007-07-01	130650
2007-10-01	137751
2008-01-01	129427
2008-04-01	134215
2008-07-01	129658
2008-10-01	406172
2009-01-01	402163
2009-04-01	441268
2009-07-01	472759
2009-10-01	482820
2010-01-01	465451
2010-04-01	435514
2010-07-01	459406
2010-10-01	437414
2011-01-01	454766
2011-04-01	494980
2011-07-01	443769
2011-10-01	436078
2012-01-01	530832
2012-04-01	572588
2012-07-01	610921
2012-10-01	759515
2013-01-01	752589
2013-04-01	778374
2013-07-01	826811
2013-10-01	849441
2014-01-01	877304
2014-04-01	900158
2014-07-01	840639
2014-10-01	822482
2015-01-01	831276
2015-04-01	846516
2015-07-01	838524
2015-10-01	909425
2016-01-01	859795
2016-04-01	796741
2016-07-01	826651
2016-10-01	812497
2017-01-01	841608
2017-04-01	913460
2017-07-01	948285
2017-10-01	953350
2018-01-01	996957