Quarter	Millions of US Dollars
1986-04-01	250
1986-07-01	250
1986-10-01	250
1987-01-01	250
1987-04-01	250
1987-07-01	250
1987-10-01	250
1988-01-01	250
1988-04-01	525
1988-07-01	516
1988-10-01	851
1989-01-01	823
1989-04-01	1010
1989-07-01	1443
1989-10-01	1760
1990-01-01	1958
1990-04-01	2118
1990-07-01	2326
1990-10-01	2468
1991-01-01	2333
1991-04-01	2538
1991-07-01	2637
1991-10-01	3082
1992-01-01	3191
1992-04-01	3560
1992-07-01	4788
1992-10-01	5452
1993-01-01	6693
1993-04-01	7390
1993-07-01	8091
1993-10-01	9205
1994-01-01	10381
1994-04-01	10982
1994-07-01	16235
1994-10-01	22007
1995-01-01	23147
1995-04-01	22988
1995-07-01	23488
1995-10-01	23435
1996-01-01	23585
1996-04-01	24531
1996-07-01	24155
1996-10-01	24304
1997-01-01	25916
1997-04-01	30148
1997-07-01	32614
1997-10-01	32837
1998-01-01	35230
1998-04-01	40813
1998-07-01	47131
1998-10-01	45698
1999-01-01	46566
1999-04-01	47450
1999-07-01	48622
1999-10-01	50599
2000-01-01	52252
2000-04-01	55915
2000-07-01	76841
2000-10-01	77245
2001-01-01	77071
2001-04-01	76510
2001-07-01	78054
2001-10-01	77624
2002-01-01	78668
2002-04-01	81684
2002-07-01	82536
2002-10-01	83386
2003-01-01	87815
2003-04-01	89518
2003-07-01	94490
2003-10-01	97819
2004-01-01	100042
2004-04-01	105246
2004-07-01	106768
2004-10-01	113391
2005-01-01	118556
2005-04-01	124418
2005-07-01	120082
2005-10-01	121591
2006-01-01	130274
2006-04-01	131568
2006-07-01	132744
2006-10-01	140369
2007-01-01	146449
2007-04-01	145545
2007-07-01	147677
2007-10-01	153331
2008-01-01	156620
2008-04-01	166395
2008-07-01	158622
2008-10-01	156373
2009-01-01	153154
2009-04-01	162482
2009-07-01	170091
2009-10-01	172777
2010-01-01	175865
2010-04-01	173972
2010-07-01	191592
2010-10-01	191385
2011-01-01	206511
2011-04-01	216918
2011-07-01	211469
2011-10-01	207944
2012-01-01	221419
2012-04-01	232159
2012-07-01	240442
2012-10-01	254099
2013-01-01	250046
2013-04-01	253707
2013-07-01	265854
2013-10-01	284801
2014-01-01	275422
2014-04-01	273935
2014-07-01	265472
2014-10-01	261290
2015-01-01	250801
2015-04-01	254485
2015-07-01	254594
2015-10-01	234734
2016-01-01	241064
2016-04-01	246509
2016-07-01	244760
2016-10-01	243006
2017-01-01	246418
2017-04-01	259243
2017-07-01	268629
2017-10-01	277685
2018-01-01	286741
2018-04-01	271479