Quarter	Millions of US Dollars
1972-07-01	31
1972-10-01	35
1973-10-01	36
1974-10-01	25
1976-04-01	50
1976-07-01	40
1976-10-01	109
1977-04-01	149
1977-10-01	224
1978-04-01	33
1978-07-01	150
1978-10-01	140
1979-01-01	150
1979-07-01	82
1979-10-01	130
1980-04-01	175
1981-04-01	-50
1982-04-01	-85
1983-04-01	-27
1983-10-01	-75
1984-04-01	-55
1984-10-01	-91
1985-10-01	-248
1986-10-01	-109
1987-01-01	-82
1987-07-01	-82
1987-10-01	-184
1988-04-01	-215
1988-07-01	-179
1988-10-01	-51
1989-01-01	-210
1989-07-01	1000
1989-10-01	-168
1994-04-01	42786
1995-04-01	952
1995-07-01	718
1995-10-01	-6
1996-01-01	284
1996-04-01	237
1996-07-01	139
1996-10-01	728
1997-01-01	610
1997-04-01	3170
1997-07-01	476
1998-01-01	1049
1998-04-01	1659
1998-07-01	-567
1998-10-01	-8663
1999-04-01	1776
1999-07-01	1223
1999-10-01	3373
2000-01-01	3372
2000-04-01	-4017
2000-07-01	7322
2000-10-01	1187
2001-01-01	2198
2001-04-01	-4859
2001-07-01	-1476
2001-10-01	-1687
2002-01-01	2455
2002-04-01	624
2002-07-01	-1147
2002-10-01	-378
2003-01-01	-566
2003-04-01	1319
2003-07-01	-80
2003-10-01	1075
2004-01-01	1500
2004-04-01	-2210
2004-07-01	1347
2004-10-01	1368
2005-01-01	2593
2005-04-01	625
2005-07-01	-42
2005-10-01	-772
2006-01-01	-1104
2006-04-01	-11301
2006-07-01	1245
2006-10-01	1246
2007-01-01	337
2007-04-01	646
2007-07-01	-1781
2007-10-01	-900
2008-01-01	-598
2008-04-01	-1094
2009-01-01	1025
2009-04-01	-179
2009-07-01	490
2009-10-01	575
2010-01-01	-1037
2010-04-01	274
2010-07-01	1164
2010-10-01	-847
2011-01-01	-1367
2011-07-01	-700
2011-10-01	2100
2012-01-01	-382
2012-04-01	1705
2012-07-01	1250
2013-04-01	354
2013-07-01	662
2013-10-01	4750
2014-04-01	1380
2014-07-01	2906
2014-10-01	-2378
2015-01-01	-3000
2015-07-01	-5530
2016-01-01	630
2016-07-01	1500
2017-01-01	-1550
2017-04-01	-427
2017-10-01	700
2018-01-01	-3009