Quarter	Millions of US Dollars
1975-10-01	18
1976-01-01	18
1976-04-01	18
1976-07-01	18
1976-10-01	18
1977-01-01	18
1977-04-01	18
1977-07-01	18
1977-10-01	18
1978-01-01	18
1978-04-01	18
1978-07-01	18
1978-10-01	18
1979-01-01	18
1979-04-01	18
1979-07-01	18
1979-10-01	18
1980-01-01	18
1980-04-01	18
1980-07-01	18
1980-10-01	18
1981-01-01	18
1981-04-01	18
1981-07-01	18
1981-10-01	42
1982-01-01	42
1982-04-01	42
1982-07-01	42
1982-10-01	42
1983-01-01	42
1983-04-01	42
1983-07-01	42
1983-10-01	42
1984-01-01	42
1984-04-01	42
1984-07-01	42
1984-10-01	42
1985-01-01	42
1985-04-01	42
1985-07-01	42
1985-10-01	42
1986-01-01	42
1986-04-01	42
1986-07-01	42
1986-10-01	18
1987-01-01	18
1987-04-01	18
1987-07-01	18
1990-10-01	50
1991-01-01	50
1991-04-01	260
1991-07-01	260
1991-10-01	297
1992-01-01	367
1992-04-01	373
1992-07-01	454
1992-10-01	532
1993-01-01	557
1993-04-01	557
1993-07-01	566
1993-10-01	904
1994-01-01	891
1994-04-01	1361
1994-07-01	1367
1994-10-01	1365
1995-01-01	834
1995-04-01	833
1995-07-01	833
1995-10-01	887
1996-01-01	1057
1996-04-01	1176
1996-07-01	1246
1996-10-01	1874
1997-01-01	2350
1997-04-01	2436
1997-07-01	2376
1997-10-01	2315
1998-01-01	2021
1998-04-01	2513
1998-07-01	2465
1998-10-01	2326
1999-01-01	2243
1999-04-01	2407
1999-07-01	1098
1999-10-01	849
2000-01-01	1638
2000-04-01	848
2000-07-01	847
2000-10-01	617
2001-01-01	552
2001-04-01	403
2001-07-01	403
2001-10-01	402
2002-01-01	325
2002-04-01	310
2002-07-01	310
2002-10-01	310
2003-01-01	310
2003-04-01	177
2003-07-01	221
2003-10-01	219
2004-01-01	121
2004-04-01	147
2004-07-01	147
2004-10-01	195
2005-01-01	198
2005-04-01	177
2005-07-01	175
2005-10-01	400
2006-01-01	405
2006-04-01	317
2006-07-01	317
2006-10-01	276
2007-01-01	275
2007-04-01	977
2007-07-01	977
2007-10-01	1104
2008-01-01	1101
2008-04-01	799
2008-07-01	751
2008-10-01	600
2009-01-01	600
2009-04-01	600
2009-07-01	975
2009-10-01	2390
2010-01-01	2865
2010-04-01	3115
2010-07-01	3115
2010-10-01	3065
2011-01-01	2630
2011-04-01	4130
2011-07-01	4130
2011-10-01	4130
2012-01-01	4630
2012-04-01	7130
2012-07-01	7130
2012-10-01	7980
2013-01-01	8830
2013-04-01	10105
2013-07-01	10105
2013-10-01	10105
2014-01-01	10105
2014-04-01	12555
2014-07-01	12180
2014-10-01	11880
2015-01-01	11839
2015-04-01	13285
2015-07-01	13281
2015-10-01	13281
2016-01-01	13236
2016-04-01	13235
2016-07-01	13234
2016-10-01	13230
2017-01-01	13232
2017-04-01	16459
2017-07-01	16510
2017-10-01	17206
2018-01-01	17547
2018-04-01	20600