Quarter	Millions of US Dollars
1969-01-01	95
1969-04-01	15
1971-10-01	60
1972-01-01	202
1972-07-01	104
1973-01-01	104
1973-04-01	47
1973-07-01	78
1974-01-01	19
1974-04-01	85
1974-07-01	172
1974-10-01	277
1975-01-01	170
1975-04-01	378
1975-07-01	165
1975-10-01	59
1976-01-01	335
1976-04-01	317
1976-07-01	114
1976-10-01	80
1977-01-01	565
1977-04-01	213
1977-07-01	218
1977-10-01	574
1978-01-01	299
1978-04-01	127
1978-07-01	159
1978-10-01	34
1979-01-01	495
1979-04-01	85
1979-07-01	-166
1979-10-01	-141
1980-01-01	-55
1980-04-01	427
1980-07-01	274
1980-10-01	297
1981-01-01	254
1981-04-01	-21
1981-07-01	81
1981-10-01	205
1982-01-01	-22
1982-04-01	223
1982-07-01	362
1982-10-01	370
1983-01-01	119
1983-04-01	21
1983-07-01	305
1983-10-01	209
1984-01-01	246
1984-04-01	31
1984-07-01	69
1984-10-01	502
1985-01-01	-89
1985-04-01	241
1985-07-01	214
1985-10-01	195
1986-01-01	757
1986-04-01	345
1986-07-01	498
1986-10-01	952
1987-01-01	-391
1987-04-01	434
1987-07-01	-91
1987-10-01	-257
1988-01-01	298
1988-04-01	542
1988-07-01	427
1988-10-01	420
1989-01-01	-53
1989-04-01	887
1989-07-01	565
1989-10-01	585
1990-01-01	1213
1990-04-01	88
1990-07-01	-87
1990-10-01	775
1991-01-01	1158
1991-04-01	413
1991-07-01	1582
1991-10-01	1723
1992-01-01	1354
1992-04-01	2009
1992-07-01	851
1992-10-01	1081
1993-01-01	683
1993-04-01	1644
1993-07-01	4313
1993-10-01	2193
1994-01-01	2620
1994-04-01	1735
1994-07-01	5209
1994-10-01	1558
1995-01-01	2390
1995-04-01	3085
1995-07-01	2190
1995-10-01	2204
1996-01-01	6447
1996-04-01	7721
1996-07-01	3594
1996-10-01	5151
1997-01-01	6216
1997-04-01	5917
1997-07-01	11934
1997-10-01	3828
1998-01-01	6973
1998-04-01	7204
1998-07-01	11385
1998-10-01	9730
1999-01-01	10060
1999-04-01	14898
1999-07-01	17242
1999-10-01	6491
2000-01-01	4888
2000-04-01	17710
2000-07-01	13588
2000-10-01	34776
2001-01-01	14342
2001-04-01	13279
2001-07-01	6237
2001-10-01	19028
2002-01-01	8946
2002-04-01	14808
2002-07-01	15521
2002-10-01	12144
2003-01-01	18437
2003-04-01	24955
2003-07-01	11527
2003-10-01	28082
2004-01-01	15339
2004-04-01	22210
2004-07-01	5241
2004-10-01	20799
2005-01-01	25359
2005-04-01	22424
2005-07-01	15145
2005-10-01	41301
2006-01-01	31239
2006-04-01	36016
2006-07-01	30520
2006-10-01	39550
2007-01-01	40041
2007-04-01	33195
2007-07-01	928
2007-10-01	4887
2008-01-01	35951
2008-04-01	44131
2008-07-01	5157
2008-10-01	21252
2009-01-01	49787
2009-04-01	47580
2009-07-01	21890
2009-10-01	1786
2010-01-01	61989
2010-04-01	-17835
2010-07-01	63647
2010-10-01	11614
2011-01-01	15967
2011-04-01	25160
2011-07-01	18522
2011-10-01	43889
2012-01-01	20349
2012-04-01	359
2012-07-01	9998
2012-10-01	3787
2013-01-01	-14046
2013-04-01	15537
2013-07-01	15532
2013-10-01	-47175
2014-01-01	11114
2014-04-01	12239
2014-07-01	-2529
2014-10-01	-7288
2015-01-01	-760
2015-04-01	14016
2015-07-01	1767
2015-10-01	-25795
2016-01-01	22003
2016-04-01	1281
2016-07-01	-4939
2016-10-01	-31951
2017-01-01	31076
2017-04-01	-5283
2017-07-01	17326
2017-10-01	-19370
2018-01-01	12055
2018-04-01	-767