Quarter	Millions of US Dollars
1983-04-01	21
1983-07-01	42
1983-10-01	43
1984-01-01	45
1984-04-01	63
1984-07-01	61
1984-10-01	159
1985-01-01	160
1985-04-01	161
1985-07-01	185
1985-10-01	299
1986-01-01	334
1986-04-01	366
1986-07-01	388
1986-10-01	375
1987-01-01	411
1987-04-01	408
1987-07-01	411
1987-10-01	494
1988-01-01	484
1988-04-01	450
1988-07-01	446
1988-10-01	480
1989-01-01	453
1989-04-01	417
1989-07-01	431
1989-10-01	418
1990-01-01	381
1990-04-01	394
1990-07-01	398
1990-10-01	221
1991-01-01	214
1991-04-01	181
1991-07-01	188
1991-10-01	200
1992-01-01	188
1992-04-01	199
1992-07-01	209
1992-10-01	200
1993-01-01	217
1993-04-01	189
1993-07-01	190
1993-10-01	224
1994-01-01	243
1994-04-01	253
1994-07-01	554
1994-10-01	551
1995-01-01	587
1995-04-01	595
1995-07-01	553
1995-10-01	348
1996-01-01	347
1996-04-01	455
1996-07-01	452
1996-10-01	446
1997-01-01	438
1997-04-01	449
1997-07-01	696
1997-10-01	1015
1998-01-01	1007
1998-04-01	4989
1998-07-01	4999
1998-10-01	5031
1999-01-01	5012
1999-04-01	5005
1999-07-01	5064
1999-10-01	5079
2000-01-01	5075
2000-04-01	5066
2000-07-01	5052
2000-10-01	5026
2001-01-01	4991
2001-04-01	4946
2001-07-01	4960
2001-10-01	4929
2002-01-01	4925
2002-04-01	4963
2002-07-01	4864
2002-10-01	5228
2003-01-01	5228
2003-04-01	5220
2003-07-01	5344
2003-10-01	5250
2004-01-01	5267
2004-04-01	5239
2004-07-01	5931
2004-10-01	5867
2005-01-01	5848
2005-04-01	5830
2005-07-01	5821
2005-10-01	6708
2006-01-01	6724
2006-04-01	6711
2006-07-01	6700
2006-10-01	7716
2007-01-01	7732
2007-04-01	7735
2007-07-01	7641
2007-10-01	7303
2008-01-01	7404
2008-04-01	4397
2008-07-01	4269
2008-10-01	4243
2009-01-01	4185
2009-04-01	7259
2009-07-01	7307
2009-10-01	7231
2010-01-01	7149
2010-04-01	7044
2010-07-01	7164
2010-10-01	7139
2011-01-01	7213
2011-04-01	7235
2011-07-01	7152
2011-10-01	7102
2012-01-01	7139
2012-04-01	7072
2012-07-01	7101
2012-10-01	7124
2013-01-01	7090
2013-04-01	6114
2013-07-01	7082
2013-10-01	7107
2014-01-01	7106
2014-04-01	7619
2014-07-01	6445
2014-10-01	6373
2015-01-01	6148
2015-04-01	6218
2015-07-01	6220
2015-10-01	6550
2016-01-01	6610
2016-04-01	6552
2016-07-01	6555
2016-10-01	5950
2017-01-01	6974
2017-04-01	7069
2017-07-01	7130
2017-10-01	7171
2018-01-01	7240
2018-04-01	7118