Quarter	Millions of US Dollars
1975-07-01	0
1975-10-01	0
1976-01-01	0
1976-04-01	0
1976-07-01	0
1976-10-01	0
1977-01-01	0
1977-04-01	0
1977-07-01	0
1977-10-01	0
1978-01-01	0
1978-04-01	0
1978-07-01	0
1978-10-01	0
1979-01-01	0
1979-04-01	0
1979-07-01	0
1979-10-01	0
1980-01-01	0
1980-04-01	0
1980-07-01	0
1980-10-01	0
1981-01-01	0
1981-04-01	0
1981-07-01	0
1981-10-01	0
1982-01-01	28
1982-04-01	28
1982-07-01	27
1982-10-01	29
1983-01-01	0
1983-04-01	0
1983-07-01	0
1983-10-01	0
1984-01-01	0
1984-04-01	0
1984-07-01	17
1984-10-01	16
1985-01-01	16
1985-04-01	16
1993-07-01	0
1993-10-01	0
1994-01-01	0
1994-04-01	0
1994-07-01	0
1994-10-01	71
1995-01-01	68
1995-04-01	169
1995-07-01	177
1995-10-01	172
1996-01-01	170
1996-04-01	88
1996-07-01	0
1996-10-01	131
1997-01-01	63
1997-04-01	172
1997-07-01	294
1997-10-01	293
1998-01-01	333
1998-04-01	772
1998-07-01	888
1998-10-01	873
1999-01-01	902
1999-04-01	175
1999-07-01	28
1999-10-01	24
2000-01-01	123
2000-04-01	257
2000-07-01	202
2000-10-01	100
2001-01-01	158
2001-04-01	95
2001-07-01	65
2001-10-01	61
2002-01-01	23
2002-04-01	149
2002-07-01	273
2002-10-01	169
2003-01-01	301
2003-04-01	74
2003-07-01	187
2003-10-01	175
2004-01-01	315
2004-04-01	319
2004-07-01	749
2004-10-01	849
2005-01-01	964
2005-04-01	900
2005-07-01	344
2005-10-01	897
2006-01-01	608
2006-04-01	634
2006-07-01	632
2006-10-01	32
2007-01-01	95
2007-04-01	110
2007-07-01	101
2007-10-01	96
2008-01-01	498
2008-04-01	434
2008-07-01	421
2008-10-01	515
2009-01-01	213
2009-04-01	205
2009-07-01	211
2009-10-01	308
2010-01-01	324
2010-04-01	347
2010-07-01	364
2010-10-01	191
2011-01-01	1356
2011-04-01	1444
2011-07-01	1341
2011-10-01	1276
2012-01-01	195
2012-04-01	260
2012-07-01	243
2012-10-01	236
2013-01-01	256
2013-04-01	1288
2013-07-01	1278
2013-10-01	1277
2014-01-01	2126
2014-04-01	1060
2014-07-01	1490
2014-10-01	1489
2015-01-01	1079
2015-04-01	1003
2015-07-01	500
2015-10-01	467
2016-01-01	159
2016-04-01	133
2016-07-01	230
2016-10-01	693
2017-01-01	710
2017-04-01	827
2017-07-01	1113
2017-10-01	1283
2018-01-01	1311
2018-04-01	2521