Quarter	Millions of US Dollars
1978-01-01	0
1978-04-01	0
1978-07-01	0
1978-10-01	0
1979-01-01	0
1979-04-01	0
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	0
1983-10-01	0
1984-01-01	0
1984-04-01	0
1984-07-01	0
1984-10-01	0
1985-01-01	0
1985-04-01	0
1985-07-01	0
1985-10-01	0
1986-01-01	0
1986-04-01	0
1986-07-01	0
1986-10-01	0
1987-01-01	0
1987-04-01	0
1987-07-01	0
1987-10-01	0
1988-01-01	0
1988-04-01	0
1988-07-01	0
1988-10-01	0
1989-01-01	15
1989-04-01	15
1989-07-01	15
1989-10-01	15
1990-01-01	0
1990-04-01	0
1990-07-01	0
1990-10-01	0
1991-01-01	0
1991-04-01	0
1991-07-01	0
1991-10-01	21
1992-01-01	26
1992-04-01	106
1992-07-01	136
1992-10-01	222
1993-01-01	229
1993-04-01	242
1993-07-01	848
1993-10-01	889
1994-01-01	906
1994-04-01	890
1994-07-01	947
1994-10-01	892
1995-01-01	747
1995-04-01	904
1995-07-01	894
1995-10-01	1560
1996-01-01	1630
1996-04-01	1552
1996-07-01	1295
1996-10-01	1098
1997-01-01	1278
1997-04-01	1205
1997-07-01	1354
1997-10-01	1222
1998-01-01	1186
1998-04-01	1208
1998-07-01	852
1998-10-01	1280
1999-01-01	1142
1999-04-01	1309
1999-07-01	1170
1999-10-01	1864
2000-01-01	1672
2000-04-01	1736
2000-07-01	1970
2000-10-01	1148
2001-01-01	1278
2001-04-01	1336
2001-07-01	1925
2001-10-01	1798
2002-01-01	2249
2002-04-01	2922
2002-07-01	2821
2002-10-01	2521
2003-01-01	2803
2003-04-01	2209
2003-07-01	1994
2003-10-01	2161
2004-01-01	1142
2004-04-01	1282
2004-07-01	674
2004-10-01	545
2005-01-01	580
2005-04-01	269
2005-07-01	234
2005-10-01	233
2006-01-01	707
2006-04-01	1019
2006-07-01	1418
2006-10-01	1429
2007-01-01	1200
2007-04-01	2019
2007-07-01	1968
2007-10-01	1980
2008-01-01	2120
2008-04-01	1276
2008-07-01	1152
2008-10-01	1342
2009-01-01	896
2009-04-01	400
2009-07-01	190
2009-10-01	503
2010-01-01	503
2010-04-01	437
2010-07-01	520
2010-10-01	131
2011-01-01	541
2011-04-01	591
2011-07-01	683
2011-10-01	647
2012-01-01	337
2012-04-01	294
2012-07-01	119
2012-10-01	307
2013-01-01	305
2013-04-01	298
2013-07-01	745
2013-10-01	821
2014-01-01	723
2014-04-01	723
2014-07-01	276
2014-10-01	0
2015-01-01	0
2015-04-01	12
2015-07-01	715
2015-10-01	1051
2016-01-01	1451
2016-04-01	2030
2016-07-01	1426
2016-10-01	1090
2017-01-01	707
2017-04-01	267
2017-07-01	317
2017-10-01	1151
2018-01-01	1134
2018-04-01	984