Quarter	Millions of US Dollars
1990-07-01	111
1990-10-01	111
1991-01-01	111
1991-04-01	111
1991-07-01	111
1991-10-01	111
1992-01-01	111
1992-04-01	111
1992-07-01	111
1992-10-01	111
1993-01-01	111
1993-04-01	111
1994-04-01	20
1994-07-01	20
1994-10-01	5860
1995-01-01	5840
1995-04-01	5840
1995-07-01	6090
1995-10-01	6090
1996-01-01	6090
1996-04-01	6190
1996-07-01	6343
1996-10-01	6381
1997-01-01	6368
1997-04-01	6689
1997-07-01	7337
1997-10-01	7895
1998-01-01	7890
1998-04-01	7896
1998-07-01	8015
1998-10-01	8523
1999-01-01	8485
1999-04-01	8629
1999-07-01	9110
1999-10-01	9959
2000-01-01	10990
2000-04-01	10585
2000-07-01	10118
2000-10-01	9326
2001-01-01	10671
2001-04-01	10367
2001-07-01	10554
2001-10-01	11436
2002-01-01	11844
2002-04-01	12594
2002-07-01	13899
2002-10-01	13612
2003-01-01	15489
2003-04-01	15732
2003-07-01	17322
2003-10-01	19673
2004-01-01	21980
2004-04-01	23192
2004-07-01	23337
2004-10-01	24481
2005-01-01	28141
2005-04-01	32842
2005-07-01	31801
2005-10-01	33361
2006-01-01	37600
2006-04-01	39317
2006-07-01	38500
2006-10-01	40224
2007-01-01	40157
2007-04-01	42156
2007-07-01	43621
2007-10-01	43999
2008-01-01	46297
2008-04-01	49443
2008-07-01	45561
2008-10-01	44335
2009-01-01	44361
2009-04-01	48521
2009-07-01	53651
2009-10-01	55900
2010-01-01	58570
2010-04-01	54487
2010-07-01	62514
2010-10-01	62589
2011-01-01	66041
2011-04-01	70328
2011-07-01	67123
2011-10-01	67187
2012-01-01	73095
2012-04-01	71554
2012-07-01	76296
2012-10-01	82350
2013-01-01	77275
2013-04-01	77781
2013-07-01	80763
2013-10-01	83348
2014-01-01	83783
2014-04-01	80686
2014-07-01	76985
2014-10-01	74462
2015-01-01	69251
2015-04-01	71311
2015-07-01	71379
2015-10-01	68101
2016-01-01	68926
2016-04-01	71729
2016-07-01	70488
2016-10-01	69797
2017-01-01	70224
2017-04-01	73047
2017-07-01	76804
2017-10-01	82380
2018-01-01	86084
2018-04-01	80117