Quarter	US Dollars, monthly level
1960-01-01	-244652580.790587000
1960-04-01	-152342227.787655980
1960-07-01	-81798809.529953900
1960-10-01	42673331.855430400
1961-01-01	-353004930.154572000
1961-04-01	-443882241.510706960
1961-07-01	-422614240.830436050
1961-10-01	-350070678.371453000
1962-01-01	-462086201.253252000
1962-04-01	-266622476.560334000
1962-07-01	-23705681.413715400
1962-10-01	36217455.518514500
1963-01-01	-358106583.128897000
1963-04-01	-401334071.577961000
1963-07-01	-277212083.724119960
1963-10-01	-242897940.755299000
1964-01-01	-678371494.588383900
1964-04-01	-484700804.825239000
1964-07-01	-128061632.596852990
1964-10-01	35663415.702054500
1965-01-01	-152919702.655332000
1965-04-01	-62632558.071275600
1965-07-01	244494955.369173020
1965-10-01	251320536.510786000
1966-01-01	-127721286.258306010
1966-04-01	-72226595.014224900
1966-07-01	188840336.820766000
1966-10-01	262566714.997685020
1967-01-01	-440236351.785264000
1967-04-01	-435047608.787965000
1967-07-01	-100299600.633287000
1967-10-01	-238601058.755055000
1968-01-01	-506398203.073667000
1968-04-01	-85518623.289525200
1968-07-01	218256108.896604000
1968-10-01	363510476.575346000
1969-01-01	-113355776.563859000
1969-04-01	272568759.299698000
1969-07-01	357434609.946161000
1969-10-01	453794752.738441000
1970-01-01	-286525208.627647040
1970-04-01	-24791637.039968397
1970-07-01	212009334.498398000
1970-10-01	538196330.714398000
1971-01-01	177243854.979718000
1971-04-01	841443148.605991000
1971-07-01	1672200474.730790000
1971-10-01	1612627481.067370000
1972-01-01	742194805.194804900
1972-04-01	1046847402.597400000
1972-07-01	1646396103.896099800
1972-10-01	1685000000.000000000
1973-01-01	224140384.948179000
1973-04-01	-755805440.482563000
1973-07-01	-344026366.506322000
1973-10-01	-525829273.284925040
1974-01-01	-3640917063.659690000
1974-04-01	-3049568533.543220000
1974-07-01	-527196751.064053950
1974-10-01	658747715.126024000
1975-01-01	-1309406004.680340000
1975-04-01	-636960616.305686000
1975-07-01	-406374655.322574000
1975-10-01	219972497.742696020
1976-01-01	-428568661.670696000
1976-04-01	521074558.093456030
1976-07-01	713821635.846758000
1976-10-01	1605530664.483759900
1977-01-01	422469208.673745000
1977-04-01	1848383105.662460000
1977-07-01	2952813519.445810000
1977-10-01	4456266526.364540000
1978-01-01	3728661456.392160000
1978-04-01	4591273984.023190500
1978-07-01	5480448322.208060000
1978-10-01	4575691810.470790000
1979-01-01	-78468649.898876400
1979-04-01	-934887962.881006000
1979-07-01	-2636858411.327230000
1979-10-01	-3843848315.377050400
1980-01-01	-5870759498.479791000
1980-04-01	-5124941577.690300000
1980-07-01	-928159461.145846000
1980-10-01	1010536056.275700000
1981-01-01	-1144006573.897820000
1981-04-01	1924307602.729600000
1981-07-01	4520461020.500480000
1981-10-01	3417856511.775960000
1982-01-01	-527362902.254052040
1982-04-01	2609184782.524160000
1982-07-01	2834902919.807920000
1982-10-01	2034721344.763939900
1983-01-01	1725292627.763830200
1983-04-01	5778462823.121370000
1983-07-01	6913081466.114800000
1983-10-01	6144155006.884650000
1984-01-01	4499784759.456010000
1984-04-01	8944869091.986061000
1984-07-01	8722270280.776901000
1984-10-01	11325675704.051401000
1985-01-01	6049489336.913899000
1985-04-01	11689734353.230700000
1985-07-01	12805472149.736300000
1985-10-01	16029307427.768402000
1986-01-01	12454285491.335300000
1986-04-01	21871283872.436800000
1986-07-01	24859712795.988100000
1986-10-01	23736930001.710403000
1987-01-01	19597205048.278202000
1987-04-01	20654919668.239304000
1987-07-01	19486763842.833000000
1987-10-01	20384752395.268600000
1988-01-01	15825486871.936000000
1988-04-01	17880226989.442300000
1988-07-01	19767009872.892300000
1988-10-01	24103107103.476902000
1989-01-01	17041604215.068600000
1989-04-01	16123216508.596900000
1989-07-01	16606434633.491598000
1989-10-01	14438683286.467800000
1990-01-01	12329156200.490100000
1990-04-01	13254168580.753101000
1990-07-01	15749363903.756401000
1990-10-01	10957860385.626500000
1991-01-01	14407470998.403000000
1991-04-01	17721036103.557400000
1991-07-01	22035110931.500298000
1991-10-01	23744550738.438198000
1992-01-01	24855636151.760200000
1992-04-01	23868057612.894700000
1992-07-01	28394620977.981300000
1992-10-01	29551956463.530300000
1993-01-01	29218893598.971100000
1993-04-01	28244829316.554600000
1993-07-01	31939376807.316200000
1993-10-01	31088880496.868900000
1994-01-01	30879047548.009800000
1994-04-01	29149820624.145000000
1994-07-01	30372660580.766000000
1994-10-01	30831424654.065900000
1995-01-01	27947558008.651300000
1995-04-01	29666422311.666500000
1995-07-01	26171015723.580300000
1995-10-01	22905794166.087300000
1996-01-01	17255208730.511997000
1996-04-01	11853332219.764200000
1996-07-01	14913611289.028801000
1996-10-01	17821874978.877200000
1997-01-01	12012176102.448100000
1997-04-01	20898863452.368900000
1997-07-01	22225783480.820100000
1997-10-01	27191631349.552002000
1998-01-01	22839710077.018700000
1998-04-01	26918203235.467600000
1998-07-01	26742690071.561400000
1998-10-01	30626268524.238900000
1999-01-01	25648102304.257800000
1999-04-01	24973920229.874200000
1999-07-01	29177571499.394802000
1999-10-01	28289225210.030000000
2000-01-01	26184428723.588303000
2000-04-01	27260108865.036000000
2000-07-01	26927258612.439500000
2000-10-01	19142699936.005600000
2001-01-01	14281129343.392801000
2001-04-01	12197157816.005800000
2001-07-01	14540996330.171299000
2001-10-01	13050726957.533201000
2002-01-01	16643188819.985199000
2002-04-01	21021427160.300000000
2002-07-01	20415872259.204100000
2002-10-01	21034795208.416500000
2003-01-01	16675688878.159199000
2003-04-01	19872287635.314900000
2003-07-01	22697861019.887100000
2003-10-01	29237381617.100597000
2004-01-01	28021045437.240498000
2004-04-01	28720606999.459000000
2004-07-01	26515522018.891100000
2004-10-01	27269704085.053700000
2005-01-01	22792837614.372997000
2005-04-01	19442146745.904800000
2005-07-01	17198892812.924400000
2005-10-01	19795979183.590900000
2006-01-01	12444001922.064200000
2006-04-01	15429811878.397500000
2006-07-01	17630732733.637100000
2006-10-01	22338673653.393803000
2007-01-01	21493363999.983200000
2007-04-01	21063314197.878700000
2007-07-01	25770431856.567898000
2007-10-01	23439234021.898300000
2008-01-01	18298859620.006400000
2008-04-01	8639412682.844700000
2008-07-01	-1313533939.780120000
2008-10-01	-6504355293.303820000
2009-01-01	-9638656768.245630000
2009-04-01	8395978729.924380000
2009-07-01	11212479640.261501000
2009-10-01	19021005309.690502000
2010-01-01	17797559072.324700000
2010-04-01	18553785042.713200000
2010-07-01	18923530404.295700000
2010-10-01	20472152344.387300000
2011-01-01	3777873123.288200000
2011-04-01	-15622219033.356000000
2011-07-01	-5391992679.241170000
2011-10-01	-15293647911.490501000
2012-01-01	-19502694211.478000000
2012-04-01	-17111271212.355198000
2012-07-01	-23728553873.672400000
2012-10-01	-26566806707.702500000
2013-01-01	-29938498331.386600000
2013-04-01	-20750606222.308400000
2013-07-01	-29791866546.632100000
2013-10-01	-36933990757.421810000
2014-01-01	-49123554672.201700000
2014-04-01	-25230439148.878200000
2014-07-01	-27718751995.662000000
2014-10-01	-20147195889.379300000
2015-01-01	-11441241385.792200000
2015-04-01	-2758366511.705480000
2015-07-01	-7777037734.390850000
2015-10-01	-1184298284.626040000
2016-01-01	2801480609.063340000
2016-04-01	13431970285.620800000
2016-07-01	9337311641.806290000
2016-10-01	11552613718.438099000
2017-01-01	2664567975.133710000
2017-04-01	6366859532.716010000
2017-07-01	10422318263.409800000
2017-10-01	6552009679.260560000
2018-01-01	-1430932692.011370200
2018-04-01	6927433938.921340000