Quarter	US Dollars, monthly level
1990-01-01	-3719057888.6531396
1990-04-01	-3613965390.7857003
1990-07-01	-6598431090.1155800
1990-10-01	-16449198356.2972980
1991-01-01	-23317323623.3716000
1991-04-01	-21224978681.1336000
1991-07-01	-15591316883.3873000
1991-10-01	-9027204242.5848100
1992-01-01	-20482136619.3393020
1992-04-01	-13540953439.1495000
1992-07-01	-7565093186.8176200
1992-10-01	-4752966504.4282410
1993-01-01	-5091388987.0437990
1993-04-01	6554560927.3119200
1993-07-01	7098623038.2965990
1993-10-01	15811249496.9669000
1994-01-01	1268219770.2754700
1994-04-01	10903988328.9462990
1994-07-01	7250220165.2432500
1994-10-01	12100825064.0459000
1995-01-01	7270780995.7128300
1995-04-01	15442342360.3100010
1995-07-01	13420732865.1712990
1995-10-01	19377354998.7608000
1996-01-01	8710700225.9579700
1996-04-01	17430109250.1289020
1996-07-01	22412620975.0011020
1996-10-01	24116364427.2652000
1997-01-01	7634100566.0903500
1997-04-01	20838825913.7908000
1997-07-01	22615842398.8491020
1997-10-01	22660105016.8411000
1998-01-01	9354462800.8198990
1998-04-01	20956504867.0800970
1998-07-01	21281992420.0419000
1998-10-01	16102736719.1965000
1999-01-01	2134666783.8990400
1999-04-01	7130316353.7943990
1999-07-01	9654665342.6992400
1999-10-01	4407168993.9543910
2000-01-01	-10824959003.6888000
2000-04-01	-7321258382.4779900
2000-07-01	-5210638754.6529000
2000-10-01	-8254567438.0711590
2001-01-01	-5091272636.2511090
2001-04-01	2753369311.7353400
2001-07-01	13209739379.8245000
2001-10-01	18356680489.3531000
2002-01-01	12830960608.0735000
2002-04-01	18080449714.3194000
2002-07-01	28068954857.2771000
2002-10-01	21245916954.4487000
2003-01-01	3523089700.2946700
2003-04-01	11782830152.4090000
2003-07-01	28165739745.4673000
2003-10-01	20878025147.6912000
2004-01-01	19365821021.1068000
2004-04-01	22731064140.9094000
2004-07-01	18641548950.3038000
2004-10-01	12709839681.5390000
2005-01-01	2637429517.2557200
2005-04-01	6769027017.1094410
2005-07-01	1293524599.0864398
2005-10-01	-10372284314.7797990
2006-01-01	-20443606394.4159000
2006-04-01	-16496993286.0811000
2006-07-01	-10325470861.5711000
2006-10-01	5840169363.5061600
2007-01-01	-11330658488.9504000
2007-04-01	3206405185.1807700
2007-07-01	4188695761.9835900
2007-10-01	-5366200143.7399500
2008-01-01	-25420834841.0169030
2008-04-01	-16476588755.0727000
2008-07-01	-34578690171.4953000
2008-10-01	-16170622166.8534000
2009-01-01	-19681902858.1905020
2009-04-01	11022458188.5495990
2009-07-01	14352299608.7537000
2009-10-01	12154276921.4526000
2010-01-01	-10485089895.5255000
2010-04-01	-5801064956.2823400
2010-07-01	-361339338.1633050
2010-10-01	-1497124412.0960700
2011-01-01	-26351357230.7806000
2011-04-01	-10263772080.1271000
2011-07-01	-6901963302.5735000
2011-10-01	12971396992.1348000
2012-01-01	-1355605429.9601600
2012-04-01	28499656180.6941000
2012-07-01	34100856991.9559020
2012-10-01	42069990256.4987950
2013-01-01	33969995109.4918980
2013-04-01	57230527395.8409040
2013-07-01	47179563861.2901000
2013-10-01	63408298143.8568000
2014-01-01	39913398764.0776000
2014-04-01	59331717241.1125000
2014-07-01	58331723619.1882000
2014-10-01	81978776544.9269000
2015-01-01	50958737815.6404950
2015-04-01	70056289450.6819000
2015-07-01	66321089173.7482100
2015-10-01	76963100938.7151000
2016-01-01	56050345692.8011000
2016-04-01	88684783610.3722000
2016-07-01	74682867326.6913900
2016-10-01	75797061543.7805000
2017-01-01	45912617730.7925950
2017-04-01	66456771651.7244950
2017-07-01	72608300779.1801000
2017-10-01	79001183897.9044000
2018-01-01	54857342625.0426940
2018-04-01	66960388046.5356000