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	419
1993-10-01	349
1994-01-01	368
1994-04-01	212
1994-07-01	70
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	348
1997-10-01	342
1998-01-01	338
1998-04-01	342
1998-07-01	268
1998-10-01	268
1999-01-01	265
1999-04-01	275
1999-07-01	275
1999-10-01	275
2000-01-01	275
2000-04-01	280
2000-07-01	275
2000-10-01	275
2001-01-01	275
2001-04-01	270
2001-07-01	220
2001-10-01	240
2002-01-01	225
2002-04-01	545
2002-07-01	330
2002-10-01	325
2003-01-01	825
2003-04-01	1085
2003-07-01	1095
2003-10-01	1095
2004-01-01	1105
2004-04-01	1345
2004-07-01	1325
2004-10-01	1338
2005-01-01	1358
2005-04-01	1338
2005-07-01	1758
2005-10-01	2245
2006-01-01	2745
2006-04-01	2745
2006-07-01	3055
2006-10-01	3135
2007-01-01	3135
2007-04-01	5236
2007-07-01	5239
2007-10-01	5203
2008-01-01	5070
2008-04-01	4790
2008-07-01	4672
2008-10-01	4550
2009-01-01	4539
2009-04-01	5119
2009-07-01	5075
2009-10-01	5612
2010-01-01	6813
2010-04-01	7033
2010-07-01	7033
2010-10-01	7160
2011-01-01	6460
2011-04-01	6447
2011-07-01	6147
2011-10-01	7327
2012-01-01	6907
2012-04-01	6247
2012-07-01	7747
2012-10-01	8355
2013-01-01	8357
2013-04-01	9053
2013-07-01	10548
2013-10-01	11130
2014-01-01	11179
2014-04-01	10713
2014-07-01	12129
2014-10-01	11853
2015-01-01	12152
2015-04-01	11346
2015-07-01	11258
2015-10-01	12263
2016-01-01	12946
2016-04-01	12931
2016-07-01	12874
2016-10-01	14209
2017-01-01	15924
2017-04-01	15684
2017-07-01	22192
2017-10-01	22525
2018-01-01	21999
2018-04-01	23822