Quarter	Millions of US Dollars
1966-04-01	0
1966-07-01	0
1966-10-01	0
1967-01-01	0
1967-04-01	0
1967-07-01	0
1967-10-01	0
1968-01-01	0
1968-04-01	0
1968-07-01	0
1968-10-01	0
1969-01-01	0
1969-04-01	0
1969-07-01	0
1969-10-01	0
1970-01-01	0
1970-04-01	0
1970-07-01	0
1970-10-01	0
1971-01-01	0
1971-04-01	0
1971-07-01	0
1971-10-01	0
1972-01-01	0
1972-04-01	0
1972-07-01	0
1972-10-01	0
1973-01-01	0
1973-04-01	0
1973-07-01	0
1973-10-01	0
1974-01-01	0
1974-04-01	0
1974-07-01	0
1974-10-01	0
1975-01-01	0
1975-04-01	0
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	9
1979-01-01	9
1979-04-01	9
1979-07-01	10
1979-10-01	0
1980-01-01	19
1980-04-01	22
1980-07-01	21
1980-10-01	20
1981-01-01	0
1981-04-01	17
1981-07-01	32
1981-10-01	33
1982-01-01	44
1982-04-01	27
1982-07-01	12
1982-10-01	25
1983-01-01	32
1983-04-01	48
1983-07-01	66
1983-10-01	60
1984-01-01	66
1984-04-01	126
1984-07-01	102
1984-10-01	262
1985-01-01	254
1985-04-01	290
1985-07-01	366
1985-10-01	251
1986-01-01	255
1986-04-01	168
1986-07-01	191
1986-10-01	157
1987-01-01	243
1987-04-01	242
1987-07-01	160
1987-10-01	299
1988-01-01	220
1988-04-01	191
1988-07-01	182
1988-10-01	76
1989-01-01	37
1989-04-01	37
1989-07-01	52
1989-10-01	27
1990-01-01	71
1990-04-01	374
1990-07-01	445
1990-10-01	566
1991-01-01	512
1991-04-01	287
1991-07-01	341
1991-10-01	428
1992-01-01	480
1992-04-01	671
1992-07-01	963
1992-10-01	963
1993-01-01	876
1993-04-01	825
1993-07-01	588
1993-10-01	482
1994-01-01	633
1994-04-01	482
1994-07-01	511
1994-10-01	674
1995-01-01	706
1995-04-01	665
1995-07-01	734
1995-10-01	350
1996-01-01	478
1996-04-01	829
1996-07-01	674
1996-10-01	717
1997-01-01	855
1997-04-01	511
1997-07-01	536
1997-10-01	564
1998-01-01	245
1998-04-01	301
1998-07-01	509
1998-10-01	503
1999-01-01	513
1999-04-01	538
1999-07-01	360
1999-10-01	728
2000-01-01	1109
2000-04-01	1296
2000-07-01	1190
2000-10-01	1302
2001-01-01	1734
2001-04-01	1627
2001-07-01	1899
2001-10-01	1931
2002-01-01	1741
2002-04-01	1110
2002-07-01	1044
2002-10-01	1092
2003-01-01	1051
2003-04-01	1049
2003-07-01	1174
2003-10-01	1303
2004-01-01	1168
2004-04-01	1068
2004-07-01	874
2004-10-01	586
2005-01-01	523
2005-04-01	2041
2005-07-01	2146
2005-10-01	2304
2006-01-01	2654
2006-04-01	1403
2006-07-01	1382
2006-10-01	871
2007-01-01	380
2007-04-01	393
2007-07-01	725
2007-10-01	941
2008-01-01	1421
2008-04-01	2267
2008-07-01	1746
2008-10-01	1495
2009-01-01	1393
2009-04-01	757
2009-07-01	2164
2009-10-01	4441
2010-01-01	4781
2010-04-01	4534
2010-07-01	3712
2010-10-01	2270
2011-01-01	1343
2011-04-01	3167
2011-07-01	2908
2011-10-01	1879
2012-01-01	2571
2012-04-01	1051
2012-07-01	1140
2012-10-01	2084
2013-01-01	1636
2013-04-01	2743
2013-07-01	2772
2013-10-01	3615
2014-01-01	4911
2014-04-01	4266
2014-07-01	3782
2014-10-01	2824
2015-01-01	945
2015-04-01	758
2015-07-01	950
2015-10-01	1180
2016-01-01	1140
2016-04-01	932
2016-07-01	773
2016-10-01	1996
2017-01-01	3293
2017-04-01	3656
2017-07-01	4330
2017-10-01	2513
2018-01-01	2604
2018-04-01	1643