Quarter	Millions of US Dollars
1989-10-01	34034
1990-01-01	35395
1990-04-01	38135
1990-07-01	42360
1990-10-01	45454
1991-01-01	40661
1991-04-01	39947
1991-07-01	44568
1991-10-01	50030
1992-01-01	48247
1992-04-01	55438
1992-07-01	62378
1992-10-01	55716
1993-01-01	58532
1993-04-01	59001
1993-07-01	63872
1993-10-01	61092
1994-01-01	64934
1994-04-01	70497
1994-07-01	73631
1994-10-01	76454
1995-01-01	90563
1995-04-01	92700
1995-07-01	90828
1995-10-01	89793
1996-01-01	76185
1996-04-01	77339
1996-07-01	87660
1996-10-01	85770
1997-01-01	81526
1997-04-01	80363
1997-07-01	81055
1997-10-01	80170
1998-01-01	81513
1998-04-01	86489
1998-07-01	94186
1998-10-01	94746
1999-01-01	98424
1999-04-01	98602
1999-07-01	108042
1999-10-01	108922
2000-01-01	110166
2000-04-01	114747
2000-07-01	106748
2000-10-01	108753
2001-01-01	109029
2001-04-01	106562
2001-07-01	114028
2001-10-01	108347
2002-01-01	112890
2002-04-01	127835
2002-07-01	126442
2002-10-01	133466
2003-01-01	145735
2003-04-01	158865
2003-07-01	153709
2003-10-01	165082
2004-01-01	164806
2004-04-01	171681
2004-07-01	177185
2004-10-01	181237
2005-01-01	184325
2005-04-01	179773
2005-07-01	178820
2005-10-01	163824
2006-01-01	176593
2006-04-01	194752
2006-07-01	187431
2006-10-01	191075
2007-01-01	207162
2007-04-01	223531
2007-07-01	243944
2007-10-01	219483
2008-01-01	236447
2008-04-01	237688
2008-07-01	217414
2008-10-01	219857
2009-01-01	222615
2009-04-01	242461
2009-07-01	244403
2009-10-01	242692
2010-01-01	227942
2010-04-01	217061
2010-07-01	241740
2010-10-01	239713
2011-01-01	260197
2011-04-01	267198
2011-07-01	252482
2011-10-01	242313
2012-01-01	255962
2012-04-01	246851
2012-07-01	249475
2012-10-01	286029
2013-01-01	284453
2013-04-01	292716
2013-07-01	315680
2013-10-01	309059
2014-01-01	312316
2014-04-01	319278
2014-07-01	286926
2014-10-01	284152
2015-01-01	256805
2015-04-01	274298
2015-07-01	267164
2015-10-01	262088
2016-01-01	282286
2016-04-01	277573
2016-07-01	270596
2016-10-01	275403
2017-01-01	269750
2017-04-01	293136
2017-07-01	308228
2017-10-01	311709
2018-01-01	318402