Quarter	Millions of US Dollars
1966-01-01	0
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	28
1978-04-01	27
1978-07-01	93
1978-10-01	147
1979-01-01	113
1979-04-01	141
1979-07-01	243
1979-10-01	183
1980-01-01	167
1980-04-01	153
1980-07-01	100
1980-10-01	151
1981-01-01	180
1981-04-01	170
1981-07-01	141
1981-10-01	101
1982-01-01	189
1982-04-01	444
1982-07-01	407
1982-10-01	436
1983-01-01	307
1983-04-01	263
1983-07-01	366
1983-10-01	395
1984-01-01	404
1984-04-01	205
1984-07-01	57
1984-10-01	284
1985-01-01	400
1985-04-01	769
1985-07-01	922
1985-10-01	856
1986-01-01	844
1986-04-01	678
1986-07-01	861
1986-10-01	1023
1987-01-01	1373
1987-04-01	1201
1987-07-01	1003
1987-10-01	776
1988-01-01	790
1988-04-01	995
1988-07-01	1534
1988-10-01	1640
1989-01-01	1229
1989-04-01	1144
1989-07-01	542
1989-10-01	898
1990-01-01	438
1990-04-01	185
1990-07-01	366
1990-10-01	971
1991-01-01	892
1991-04-01	1727
1991-07-01	1798
1991-10-01	1406
1992-01-01	2022
1992-04-01	1904
1992-07-01	2327
1992-10-01	2141
1993-01-01	1623
1993-04-01	1548
1993-07-01	2286
1993-10-01	2198
1994-01-01	2540
1994-04-01	2196
1994-07-01	2116
1994-10-01	2136
1995-01-01	1968
1995-04-01	1461
1995-07-01	1727
1995-10-01	1643
1996-01-01	2213
1996-04-01	2716
1996-07-01	2222
1996-10-01	2372
1997-01-01	1215
1997-04-01	917
1997-07-01	771
1997-10-01	1300
1998-01-01	1151
1998-04-01	1154
1998-07-01	958
1998-10-01	1000
1999-01-01	375
1999-04-01	693
1999-07-01	1155
1999-10-01	1057
2000-01-01	1262
2000-04-01	1030
2000-07-01	788
2000-10-01	794
2001-01-01	412
2001-04-01	594
2001-07-01	733
2001-10-01	669
2002-01-01	641
2002-04-01	405
2002-07-01	360
2002-10-01	336
2003-01-01	519
2003-04-01	669
2003-07-01	603
2003-10-01	938
2004-01-01	513
2004-04-01	764
2004-07-01	837
2004-10-01	994
2005-01-01	600
2005-04-01	476
2005-07-01	276
2005-10-01	466
2006-01-01	300
2006-04-01	300
2006-07-01	300
2006-10-01	25
2007-01-01	148
2007-04-01	529
2007-07-01	556
2007-10-01	555
2008-01-01	401
2008-04-01	0
2008-07-01	100
2008-10-01	0
2009-01-01	100
2009-04-01	100
2009-07-01	0
2009-10-01	0
2010-01-01	150
2010-04-01	150
2010-07-01	150
2010-10-01	150
2011-01-01	50
2011-04-01	374
2011-07-01	380
2011-10-01	508
2012-01-01	444
2012-04-01	126
2012-07-01	129
2012-10-01	885
2013-01-01	1824
2013-04-01	0
2013-07-01	8
2013-10-01	8
2014-01-01	8
2014-04-01	8
2014-07-01	0
2014-10-01	0
2015-01-01	0
2015-04-01	500
2015-07-01	600
2015-10-01	300
2016-01-01	300
2016-04-01	100
2016-07-01	0
2016-10-01	0
2017-01-01	0
2017-04-01	0
2017-07-01	0
2017-10-01	0
2018-01-01	0
2018-04-01	0