Quarter	Millions of US Dollars
1983-10-01	43
1984-01-01	45
1984-04-01	42
1984-07-01	41
1984-10-01	40
1985-01-01	40
1985-04-01	40
1985-07-01	46
1985-10-01	50
1986-01-01	56
1986-04-01	61
1986-07-01	65
1986-10-01	63
1987-01-01	68
1987-04-01	68
1987-07-01	68
1987-10-01	82
1988-01-01	81
1988-04-01	75
1988-07-01	74
1988-10-01	80
1989-01-01	75
1989-04-01	70
1989-07-01	72
1989-10-01	70
1990-01-01	63
1990-04-01	66
1990-07-01	72
1990-10-01	74
1991-01-01	71
1991-04-01	72
1991-07-01	75
1991-10-01	80
1992-01-01	75
1992-04-01	79
1992-07-01	84
1992-10-01	80
1993-01-01	87
1993-04-01	95
1993-07-01	595
1993-10-01	947
1994-01-01	1186
1994-04-01	1940
1994-07-01	2043
1994-10-01	2796
1995-01-01	2868
1995-04-01	2884
1995-07-01	4351
1995-10-01	4680
1996-01-01	4929
1996-04-01	5115
1996-07-01	5149
1996-10-01	7128
1997-01-01	7199
1997-04-01	8167
1997-07-01	8613
1997-10-01	8858
1998-01-01	8785
1998-04-01	8735
1998-07-01	8663
1998-10-01	8873
1999-01-01	9245
1999-04-01	9111
1999-07-01	9969
1999-10-01	9886
2000-01-01	9874
2000-04-01	9978
2000-07-01	9924
2000-10-01	9877
2001-01-01	9726
2001-04-01	10175
2001-07-01	10251
2001-10-01	9956
2002-01-01	10058
2002-04-01	10236
2002-07-01	9748
2002-10-01	9612
2003-01-01	9518
2003-04-01	9445
2003-07-01	8711
2003-10-01	8224
2004-01-01	7927
2004-04-01	7205
2004-07-01	7545
2004-10-01	7328
2005-01-01	7076
2005-04-01	7053
2005-07-01	6465
2005-10-01	6442
2006-01-01	6328
2006-04-01	6221
2006-07-01	6208
2006-10-01	5403
2007-01-01	5314
2007-04-01	4549
2007-07-01	4573
2007-10-01	4749
2008-01-01	4790
2008-04-01	4769
2008-07-01	4763
2008-10-01	4814
2009-01-01	4606
2009-04-01	4614
2009-07-01	4228
2009-10-01	4223
2010-01-01	4228
2010-04-01	4223
2010-07-01	4241
2010-10-01	4247
2011-01-01	4245
2011-04-01	3651
2011-07-01	3653
2011-10-01	3652
2012-01-01	3645
2012-04-01	3646
2012-07-01	3656
2012-10-01	3371
2013-01-01	3986
2013-04-01	3986
2013-07-01	3986
2013-10-01	3986
2014-01-01	3986
2014-04-01	3986
2014-07-01	3286
2014-10-01	3286
2015-01-01	3286
2015-04-01	3286
2015-07-01	2760
2015-10-01	2760
2016-01-01	2760
2016-04-01	2760
2016-07-01	2760
2016-10-01	3588
2017-01-01	3591
2017-04-01	3592
2017-07-01	3594
2017-10-01	3596
2018-01-01	3200
2018-04-01	3195