Quarter	US Dollars, monthly level
1988-01-01	-609500000.0000000
1988-04-01	-871500000.0000000
1988-07-01	-724500000.0000000
1988-10-01	-709900000.0000000
1989-01-01	-630200000.0000000
1989-04-01	-725600000.0000000
1989-07-01	-518000000.0000000
1989-10-01	-594100000.0000000
1990-01-01	-682500000.0000000
1990-04-01	-928200000.0000000
1990-07-01	-856900000.0000000
1990-10-01	-1189800000.0000000
1991-01-01	-1023200000.0000001
1991-04-01	-1629700000.0000000
1991-07-01	-1384600000.0000000
1991-10-01	-1584600000.0000000
1992-01-01	-1584300000.0000000
1992-04-01	-1572300000.0000000
1992-07-01	-1592300000.0000000
1992-10-01	-1534800000.0000000
1993-01-01	-1742200000.0000000
1993-04-01	-1708200000.0000000
1993-07-01	-1360400000.0000000
1993-10-01	-1535100000.0000000
1994-01-01	-1817400000.0000000
1994-04-01	-2264100000.0000000
1994-07-01	-1625400000.0000000
1994-10-01	-1809300000.0000000
1995-01-01	-2655800000.0000000
1995-04-01	-2377300000.0000000
1995-07-01	-2510600000.0000000
1995-10-01	-2827700000.0000000
1996-01-01	-2973200000.0000000
1996-04-01	-2819800000.0000000
1996-07-01	-2639400000.0000000
1996-10-01	-2387700000.0000000
1997-01-01	-2275100000.0000000
1997-04-01	-2155300000.0000000
1997-07-01	-1844200000.0000000
1997-10-01	-2110399999.9999998
1998-01-01	-1605200000.0000000
1998-04-01	-1562000000.0000000
1998-07-01	-1682600000.0000000
1998-10-01	-1527600000.0000000
1999-01-01	-1958500000.0000000
1999-04-01	-2023699999.9999998
1999-07-01	-1979200000.0000000
1999-10-01	-1890200000.0000000
2000-01-01	-1764000000.0000000
2000-04-01	-1690000000.0000000
2000-07-01	-1747100000.0000000
2000-10-01	-1679100000.0000000
2001-01-01	-1933700000.0000000
2001-04-01	-1947100000.0000000
2001-07-01	-1722100000.0000000
2001-10-01	-1375100000.0000000
2002-01-01	-1313100000.0000000
2002-04-01	-1837900000.0000000
2002-07-01	-1602200000.0000000
2002-10-01	-2164400000.0000000
2003-01-01	-819900000.0000000
2003-04-01	-1646200000.0000000
2003-07-01	-1754100000.0000000
2003-10-01	-1573900000.0000000
2004-01-01	-1194800000.0000000
2004-04-01	-1412100000.0000000
2004-07-01	-1861300000.0000000
2004-10-01	-2075899999.9999998
2005-01-01	-1389400000.0000000
2005-04-01	-1973200000.0000000
2005-07-01	-2389300000.0000000
2005-10-01	-2093999999.9999998
2006-01-01	-1720800000.0000000
2006-04-01	-1558800000.0000000
2006-07-01	-1997000000.0000000
2006-10-01	-2340800000.0000000
2007-01-01	-1257900000.0000000
2007-04-01	-2109000000.0000000
2007-07-01	-3668100000.0000000
2007-10-01	-3154200000.0000000
2008-01-01	-2814300000.0000000
2008-04-01	-3225700000.0000000
2008-07-01	-3877100000.0000000
2008-10-01	-3293600000.0000000
2009-01-01	-1081500000.0000000
2009-04-01	-950500000.0000000
2009-07-01	-1894400000.0000000
2009-10-01	-935500000.0000000
2010-01-01	-1126700000.0000000
2010-04-01	-1211000000.0000000
2010-07-01	-2238300000.0000000
2010-10-01	-3249900000.0000000
2011-01-01	-2873100000.0000000
2011-04-01	-3635800000.0000000
2011-07-01	-3924500000.0000000
2011-10-01	-4181600000.0000005
2012-01-01	-5225400000.0000000
2012-04-01	-4653700000.0000000
2012-07-01	-4251600000.0000000
2012-10-01	-4167600000.0000000
2013-01-01	-2794700000.0000000
2013-04-01	-3197900000.0000000
2013-07-01	-4986300000.0000000
2013-10-01	-3252200000.0000000
2014-01-01	-2362900000.0000000
2014-04-01	-3799300000.0000000
2014-07-01	-4277199999.9999995
2014-10-01	-3372800000.0000000
2015-01-01	-1038300000.0000000
2015-04-01	-2150200000.0000000
2015-07-01	-2559500000.0000000
2015-10-01	-2055300000.0000000
2016-01-01	-2307700000.0000000
2016-04-01	-3465000000.0000000
2016-07-01	-4136999999.9999995
2016-10-01	-2966700000.0000000
2017-01-01	-1956000000.0000000
2017-04-01	-3264100000.0000000
2017-07-01	-5120200000.0000000
2017-10-01	-4666100000.0000000
2018-01-01	-5063000000.0000000
2018-04-01	-6076300000.0000000
2018-07-01	-7659000000.0000000