Quarter	Millions of US Dollars
1976-04-01	10
1976-07-01	10
1976-10-01	45
1977-01-01	73
1977-04-01	74
1977-07-01	74
1977-10-01	75
1978-01-01	102
1978-04-01	102
1978-07-01	170
1978-10-01	171
1979-01-01	168
1979-04-01	168
1979-07-01	190
1979-10-01	191
1980-01-01	211
1980-04-01	218
1980-07-01	218
1980-10-01	214
1981-01-01	211
1981-04-01	205
1981-07-01	205
1981-10-01	208
1982-01-01	204
1982-04-01	202
1982-07-01	199
1982-10-01	202
1983-01-01	200
1983-04-01	199
1983-07-01	199
1983-10-01	198
1984-01-01	198
1984-04-01	196
1984-07-01	192
1984-10-01	189
1985-01-01	189
1985-04-01	189
1985-07-01	194
1985-10-01	174
1986-01-01	175
1986-04-01	174
1986-07-01	168
1986-10-01	134
1987-01-01	113
1987-04-01	111
1987-07-01	97
1987-10-01	104
1988-01-01	76
1988-04-01	72
1988-07-01	32
1988-10-01	30
1989-01-01	28
1989-04-01	27
1989-07-01	24
1989-10-01	25
1996-07-01	290
1996-10-01	386
1997-01-01	365
1997-04-01	355
1997-07-01	353
1997-10-01	350
1998-01-01	343
1998-04-01	348
1998-07-01	367
1998-10-01	367
1999-01-01	346
1999-04-01	479
1999-07-01	492
1999-10-01	469
2000-01-01	451
2000-04-01	451
2000-07-01	422
2000-10-01	442
2001-01-01	424
2001-04-01	412
2001-07-01	435
2001-10-01	324
2002-01-01	320
2002-04-01	366
2002-07-01	137
2002-10-01	145
2003-01-01	151
2003-04-01	158
2003-07-01	628
2003-10-01	680
2004-01-01	659
2004-04-01	486
2004-07-01	496
2004-10-01	545
2005-01-01	519
2005-04-01	484
2005-07-01	482
2005-10-01	472
2006-01-01	484
2006-04-01	509
2006-07-01	506
2006-10-01	527
2007-01-01	533
2007-04-01	1215
2007-07-01	1276
2007-10-01	1325
2008-01-01	1423
2008-04-01	1419
2008-07-01	715
2008-10-01	696
2009-01-01	665
2009-04-01	707
2009-07-01	732
2009-10-01	720
2010-01-01	674
2010-04-01	614
2010-07-01	682
2010-10-01	2004
2011-01-01	2131
2011-04-01	2168
2011-07-01	2025
2011-10-01	1941
2012-01-01	2003
2012-04-01	1889
2012-07-01	1940
2012-10-01	3479
2013-01-01	3421
2013-04-01	3462
2013-07-01	3526
2013-10-01	4169
2014-01-01	4168
2014-04-01	7064
2014-07-01	6868
2014-10-01	6756
2015-01-01	6404
2015-04-01	7513
2015-07-01	7670
2015-10-01	7587
2016-01-01	7652
2016-04-01	7579
2016-07-01	7594
2016-10-01	7747
2017-01-01	7786
2017-04-01	7402
2017-07-01	7484
2017-10-01	7523
2018-01-01	7590
2018-04-01	7458