Quarter	Millions of US Dollars
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	0
1982-04-01	0
1982-07-01	0
1982-10-01	0
1983-01-01	0
1983-04-01	0
1983-07-01	190
1983-10-01	183
1984-01-01	193
1984-04-01	180
1984-07-01	0
1984-10-01	0
1985-01-01	0
1985-04-01	0
1985-07-01	46
1985-10-01	150
1986-01-01	511
1986-04-01	881
1986-07-01	1244
1986-10-01	1923
1987-01-01	2133
1987-04-01	1766
1987-07-01	1615
1987-10-01	828
1988-01-01	650
1988-04-01	887
1988-07-01	631
1988-10-01	647
1989-01-01	229
1989-04-01	0
1989-07-01	125
1989-10-01	129
1990-01-01	907
1990-04-01	1217
1990-07-01	1491
1990-10-01	2013
1991-01-01	1318
1991-04-01	1126
1991-07-01	1163
1991-10-01	1314
1992-01-01	1580
1992-04-01	1867
1992-07-01	1771
1992-10-01	1495
1993-01-01	1206
1993-04-01	1413
1993-07-01	2599
1993-10-01	2321
1994-01-01	2302
1994-04-01	1586
1994-07-01	1781
1994-10-01	1839
1995-01-01	4316
1995-04-01	4875
1995-07-01	5069
1995-10-01	4804
1996-01-01	3463
1996-04-01	2898
1996-07-01	1719
1996-10-01	1656
1997-01-01	1564
1997-04-01	2292
1997-07-01	2593
1997-10-01	2915
1998-01-01	2448
1998-04-01	1810
1998-07-01	1639
1998-10-01	2753
1999-01-01	3047
1999-04-01	2858
1999-07-01	2689
1999-10-01	1007
2000-01-01	1137
2000-04-01	856
2000-07-01	1105
2000-10-01	1688
2001-01-01	1725
2001-04-01	2966
2001-07-01	2682
2001-10-01	2026
2002-01-01	1289
2002-04-01	0
2002-07-01	0
2002-10-01	1536
2003-01-01	1557
2003-04-01	1584
2003-07-01	1596
2003-10-01	701
2004-01-01	722
2004-04-01	689
2004-07-01	1178
2004-10-01	500
2005-01-01	500
2005-04-01	500
2005-07-01	6021
2005-10-01	5899
2006-01-01	6052
2006-04-01	6357
2006-07-01	0
2006-10-01	0
2007-01-01	812
2007-04-01	824
2007-07-01	865
2007-10-01	898
2008-01-01	0
2008-04-01	0
2008-07-01	0
2008-10-01	1
2009-01-01	0
2009-04-01	500
2009-07-01	500
2009-10-01	500
2010-01-01	500
2010-04-01	0
2010-07-01	6824
2010-10-01	6681
2011-01-01	14207
2011-04-01	14453
2011-07-01	15503
2011-10-01	14939
2012-01-01	15356
2012-04-01	14653
2012-07-01	8530
2012-10-01	8663
2013-01-01	9145
2013-04-01	9233
2013-07-01	8718
2013-10-01	8876
2014-01-01	4215
2014-04-01	4633
2014-07-01	3274
2014-10-01	3229
2015-01-01	4656
2015-04-01	4492
2015-07-01	4610
2015-10-01	4480
2016-01-01	114
2016-04-01	694
2016-07-01	1586
2016-10-01	1498
2017-01-01	3519
2017-04-01	4023
2017-07-01	3012
2017-10-01	3823
2018-01-01	1857
2018-04-01	819