Quarter	Millions of US Dollars
1975-07-01	19
1975-10-01	19
1976-01-01	48
1976-04-01	47
1976-07-01	50
1976-10-01	52
1977-01-01	51
1977-04-01	52
1977-07-01	52
1977-10-01	57
1978-01-01	59
1978-04-01	58
1978-07-01	61
1978-10-01	65
1979-01-01	64
1979-04-01	64
1979-07-01	68
1979-10-01	68
1980-01-01	61
1980-04-01	67
1980-07-01	66
1980-10-01	61
1981-01-01	56
1981-04-01	49
1981-07-01	50
1981-10-01	53
1982-01-01	49
1982-04-01	48
1982-07-01	47
1982-10-01	50
1983-01-01	21
1983-04-01	20
1983-07-01	19
1983-10-01	18
1984-01-01	19
1984-04-01	18
1984-07-01	17
1984-10-01	16
1985-01-01	16
1985-04-01	16
1993-07-01	110
1993-10-01	110
1994-01-01	110
1994-04-01	110
1994-07-01	110
1994-10-01	181
1995-01-01	178
1995-04-01	190
1995-07-01	198
1995-10-01	193
1996-01-01	191
1996-04-01	109
1996-07-01	107
1996-10-01	152
1997-01-01	84
1997-04-01	193
1997-07-01	302
1997-10-01	301
1998-01-01	341
1998-04-01	879
1998-07-01	1622
1998-10-01	1611
1999-01-01	2118
1999-04-01	1334
1999-07-01	1229
1999-10-01	1150
2000-01-01	1324
2000-04-01	1479
2000-07-01	1344
2000-10-01	1313
2001-01-01	1306
2001-04-01	1200
2001-07-01	1285
2001-10-01	1234
2002-01-01	1195
2002-04-01	1383
2002-07-01	1501
2002-10-01	1481
2003-01-01	1646
2003-04-01	1428
2003-07-01	1464
2003-10-01	1698
2004-01-01	1631
2004-04-01	3177
2004-07-01	3062
2004-10-01	3284
2005-01-01	2999
2005-04-01	2873
2005-07-01	2313
2005-10-01	2936
2006-01-01	2671
2006-04-01	2746
2006-07-01	2740
2006-10-01	2179
2007-01-01	2411
2007-04-01	2442
2007-07-01	2494
2007-10-01	2539
2008-01-01	2657
2008-04-01	2587
2008-07-01	2478
2008-10-01	2550
2009-01-01	2206
2009-04-01	2253
2009-07-01	2731
2009-10-01	3538
2010-01-01	3463
2010-04-01	3839
2010-07-01	4092
2010-10-01	5525
2011-01-01	5694
2011-04-01	6231
2011-07-01	5905
2011-10-01	5714
2012-01-01	6365
2012-04-01	6566
2012-07-01	7528
2012-10-01	7892
2013-01-01	7964
2013-04-01	8472
2013-07-01	8665
2013-10-01	10160
2014-01-01	10176
2014-04-01	9749
2014-07-01	9482
2014-10-01	9348
2015-01-01	9139
2015-04-01	10796
2015-07-01	10764
2015-10-01	10529
2016-01-01	10700
2016-04-01	10545
2016-07-01	10509
2016-10-01	10082
2017-01-01	10206
2017-04-01	10617
2017-07-01	11162
2017-10-01	10746
2018-01-01	11899
2018-04-01	13768