Quarter	Millions of US Dollars
1995-01-01	-189
1995-04-01	-120
1995-07-01	-834
1995-10-01	-77
1996-01-01	-362
1996-04-01	-295
1996-07-01	-228
1996-10-01	-235
1997-01-01	-115
1997-04-01	-11
1997-07-01	-153
1997-10-01	-80
1998-01-01	-92
1998-04-01	3538
1998-07-01	1261
1998-10-01	5472
1999-01-01	2712
1999-04-01	1405
1999-07-01	440
1999-10-01	1166
2000-01-01	-874
2000-04-01	687
2000-07-01	1486
2000-10-01	511
2001-01-01	600
2001-04-01	-201
2001-07-01	1243
2001-10-01	511
2002-01-01	1694
2002-04-01	371
2002-07-01	7167
2002-10-01	763
2003-01-01	-1006
2003-04-01	75
2003-07-01	1339
2003-10-01	-709
2004-01-01	178
2004-04-01	391
2004-07-01	4778
2004-10-01	-644
2005-01-01	475
2005-04-01	-208
2005-07-01	2216
2005-10-01	938
2006-01-01	1945
2006-04-01	1305
2006-07-01	1217
2006-10-01	-37
2007-01-01	3425
2007-04-01	-147
2007-07-01	-60
2007-10-01	1016
2008-01-01	2118
2008-04-01	1268
2008-07-01	134
2008-10-01	-1614
2009-01-01	7204
2009-04-01	1606
2009-07-01	4143
2009-10-01	-553
2010-01-01	3366
2010-04-01	2953
2010-07-01	989
2010-10-01	-59
2011-01-01	-1598
2011-04-01	349
2011-07-01	8093
2011-10-01	-5766
2012-01-01	4888
2012-04-01	8082
2012-07-01	1574
2012-10-01	-10
2013-01-01	1246
2013-04-01	3640
2013-07-01	4481
2013-10-01	1314
2014-01-01	2399
2014-04-01	-652
2014-07-01	269
2014-10-01	-896
2015-01-01	5661
2015-04-01	-76
2015-07-01	2386
2015-10-01	5271
2016-01-01	10247
2016-04-01	-1557
2016-07-01	5097
2016-10-01	-8908
2017-01-01	5730
2017-04-01	-1612
2017-07-01	5303
2017-10-01	1213
2018-01-01	1448