Quarter	Millions of US Dollars
1983-07-01	38
1983-10-01	37
1984-01-01	139
1984-04-01	136
1984-07-01	133
1984-10-01	132
1985-01-01	133
1985-04-01	329
1985-07-01	334
1985-10-01	337
1986-01-01	339
1986-04-01	342
1986-07-01	345
1986-10-01	348
1987-01-01	609
1987-04-01	599
1987-07-01	676
1987-10-01	745
1988-01-01	794
1988-04-01	642
1988-07-01	640
1988-10-01	723
1989-01-01	598
1989-04-01	577
1989-07-01	625
1989-10-01	645
1990-01-01	593
1990-04-01	487
1990-07-01	469
1990-10-01	465
1991-01-01	435
1991-04-01	444
1991-07-01	489
1991-10-01	499
1992-01-01	483
1992-04-01	421
1992-07-01	434
1992-10-01	431
1993-01-01	409
1993-04-01	405
1993-07-01	387
1993-10-01	294
1994-01-01	314
1994-04-01	158
1994-07-01	47
1994-10-01	46
1995-01-01	32
1995-04-01	22
1995-07-01	82
1995-10-01	72
1996-01-01	72
1996-04-01	78
1996-07-01	128
1996-10-01	128
1997-01-01	148
1997-04-01	142
1997-07-01	866
1997-10-01	874
1998-01-01	878
1998-04-01	878
1998-07-01	813
1998-10-01	889
1999-01-01	871
1999-04-01	1073
1999-07-01	1108
1999-10-01	1183
2000-01-01	1360
2000-04-01	1329
2000-07-01	1387
2000-10-01	1396
2001-01-01	1347
2001-04-01	1517
2001-07-01	1460
2001-10-01	1478
2002-01-01	1449
2002-04-01	2178
2002-07-01	2019
2002-10-01	1946
2003-01-01	2534
2003-04-01	2711
2003-07-01	3058
2003-10-01	3166
2004-01-01	3177
2004-04-01	3722
2004-07-01	3114
2004-10-01	3314
2005-01-01	3316
2005-04-01	3561
2005-07-01	3927
2005-10-01	4411
2006-01-01	4902
2006-04-01	4745
2006-07-01	5049
2006-10-01	5093
2007-01-01	5108
2007-04-01	5732
2007-07-01	6006
2007-10-01	6098
2008-01-01	6055
2008-04-01	5893
2008-07-01	5655
2008-10-01	5600
2009-01-01	5439
2009-04-01	6054
2009-07-01	6030
2009-10-01	6724
2010-01-01	7842
2010-04-01	8516
2010-07-01	8615
2010-10-01	8713
2011-01-01	8042
2011-04-01	8067
2011-07-01	7679
2011-10-01	8753
2012-01-01	8813
2012-04-01	8714
2012-07-01	10260
2012-10-01	11085
2013-01-01	10645
2013-04-01	11159
2013-07-01	12638
2013-10-01	12525
2014-01-01	12515
2014-04-01	11910
2014-07-01	13012
2014-10-01	12571
2015-01-01	13188
2015-04-01	12457
2015-07-01	12430
2015-10-01	13379
2016-01-01	14044
2016-04-01	14010
2016-07-01	13745
2016-10-01	16004
2017-01-01	17741
2017-04-01	17235
2017-07-01	23707
2017-10-01	23902
2018-01-01	23960
2018-04-01	25754