Quarter	US Dollars, monthly level
1960-01-01	190732131.67620600
1960-04-01	179295659.84063300
1960-07-01	141157011.59141500
1960-10-01	204784177.29102200
1961-01-01	198543801.33749300
1961-04-01	169399279.99480700
1961-07-01	127426487.59938500
1961-10-01	201961858.12233600
1962-01-01	210060457.07100900
1962-04-01	172654086.55442798
1962-07-01	141073138.53251300
1962-10-01	197731924.62129800
1963-01-01	166583349.78804200
1963-04-01	158915037.59612900
1963-07-01	148973187.23359802
1963-10-01	247625238.61203900
1964-01-01	254859224.61926103
1964-04-01	229492024.72524900
1964-07-01	166286775.76068702
1964-10-01	303674150.11748400
1965-01-01	218336099.84462200
1965-04-01	216963167.61026898
1965-07-01	189431803.80623000
1965-10-01	345448002.97569100
1966-01-01	247361057.76629400
1966-04-01	349559203.07978300
1966-07-01	264719686.96050203
1966-10-01	390635460.70702400
1967-01-01	346889211.34481996
1967-04-01	316389337.37897000
1967-07-01	299136541.51919100
1967-10-01	415463769.71832700
1968-01-01	384028693.56274500
1968-04-01	365560709.47019297
1968-07-01	353194651.13992800
1968-10-01	484932939.60017900
1969-01-01	472243561.06356800
1969-04-01	448864271.65977900
1969-07-01	402065638.11951600
1969-10-01	574150020.67868210
1970-01-01	549624524.78562390
1970-04-01	616220839.76490200
1970-07-01	507583887.61732300
1970-10-01	712658081.73797800
1971-01-01	704887180.99692810
1971-04-01	745845701.72337810
1971-07-01	631099753.72379900
1971-10-01	878158724.37534200
1972-01-01	972154463.64220610
1972-04-01	927080493.16964400
1972-07-01	849634366.72343100
1972-10-01	1065403322.06042000
1973-01-01	1245232321.13129000
1973-04-01	1252108525.70651000
1973-07-01	1269436972.19637010
1973-10-01	1441834289.03328010
1974-01-01	1563508932.88407000
1974-04-01	1745559564.19055990
1974-07-01	1559357670.29183980
1974-10-01	2217699291.92655000
1975-01-01	1994121343.58939000
1975-04-01	1944842259.54924000
1975-07-01	1548592635.62258000
1975-10-01	2181567022.90274000
1976-01-01	2244446896.10558000
1976-04-01	1854689074.58809000
1976-07-01	2043039104.02351000
1976-10-01	2577359813.04346000
1977-01-01	2567427707.12591030
1977-04-01	2597114084.91189000
1977-07-01	2190478457.86945000
1977-10-01	2857532885.85567000
1978-01-01	3052111192.63743970
1978-04-01	3184098811.39162000
1978-07-01	2941055030.67691000
1978-10-01	3940201492.46750000
1979-01-01	4241289370.17954060
1979-04-01	4490376763.64098000
1979-07-01	4177878910.12723000
1979-10-01	5290011599.79056000
1980-01-01	5098488696.95356000
1980-04-01	5190753043.99423000
1980-07-01	4249098507.74177000
1980-10-01	5807551589.09738000
1981-01-01	4389943366.14524000
1981-04-01	5164775651.28994000
1981-07-01	5008238253.45494000
1981-10-01	5818949747.47221000
1982-01-01	5408189315.25794000
1982-04-01	4854886447.14880000
1982-07-01	4664918421.67120100
1982-10-01	5614324549.85370100
1983-01-01	4774423709.91064000
1983-04-01	5101483986.45949000
1983-07-01	4378879428.43519000
1983-10-01	5496453719.04152000
1984-01-01	6079263475.24172000
1984-04-01	6320254039.86116000
1984-07-01	5206328766.11998000
1984-10-01	5933816833.06899000
1985-01-01	5384825364.00794000
1985-04-01	5763699480.78313000
1985-07-01	5515263026.31054000
1985-10-01	7570377989.65854000
1986-01-01	6024569492.74843000
1986-04-01	7065575236.36321000
1986-07-01	6080819792.64914000
1986-10-01	8075400557.01010900
1987-01-01	7538059689.70333000
1987-04-01	8496793367.04132900
1987-07-01	7947537427.98018000
1987-10-01	10152698067.93940200
1988-01-01	9917195085.01197000
1988-04-01	10495212425.77439900
1988-07-01	8895708508.09963000
1988-10-01	11005867888.61980000
1989-01-01	11021433025.08030100
1989-04-01	11117101147.03650000
1989-07-01	9143190149.84612000
1989-10-01	12141711388.51179900
1990-01-01	12441479414.98910000
1990-04-01	13592348269.63080000
1990-07-01	12447628225.35120000
1990-10-01	17160134643.33820000
1991-01-01	15893227002.43150000
1991-04-01	15001973216.18350000
1991-07-01	12008415214.15680000
1991-10-01	17236042887.28769700
1992-01-01	15988648300.17040000
1992-04-01	16503100481.72770000
1992-07-01	14713301935.29660000
1992-10-01	17125802439.08900000
1993-01-01	15436053458.59980000
1993-04-01	16339006827.57720200
1993-07-01	12977096569.89300000
1993-10-01	16312224929.97990200
1994-01-01	16724691140.93650000
1994-04-01	18463666226.68940000
1994-07-01	16627917926.75459900
1994-10-01	21448713190.56500200
1995-01-01	24172028679.52010000
1995-04-01	25645858882.05060200
1995-07-01	22208034035.94310000
1995-10-01	27862381033.18680200
1996-01-01	28105532715.31670000
1996-04-01	27959442797.34610000
1996-07-01	24836335758.27229700
1996-10-01	29987561615.75769800
1997-01-01	24358355374.25170000
1997-04-01	26577741503.92250000
1997-07-01	21910004305.53420300
1997-10-01	28198013261.80820000
1998-01-01	27123478276.11829800
1998-04-01	29035660640.79129800
1998-07-01	24943037933.80359600
1998-10-01	30284469006.28410300
1999-01-01	26410734583.94610000
1999-04-01	26349960762.69790000
1999-07-01	23479882688.08289700
1999-10-01	28160090096.73580000
2000-01-01	29571727379.86710000
2000-04-01	30110958438.51230000
2000-07-01	25507007497.97620000
2000-10-01	29878028351.83200000
2001-01-01	31675390396.67150000
2001-04-01	29701960527.74370200
2001-07-01	25966094581.18440000
2001-10-01	29384929876.87960000
2002-01-01	28966200173.83630000
2002-04-01	32124159398.12260000
2002-07-01	29648561497.32610000
2002-10-01	34819052485.50990000
2003-01-01	37496997937.90680000
2003-04-01	40492488898.22880000
2003-07-01	35048006778.90190000
2003-10-01	43221295944.92460000
2004-01-01	45503328638.45320000
2004-04-01	46164666300.58520500
2004-07-01	40994901547.56480400
2004-10-01	49982320563.45840500
2005-01-01	48294602745.36850000
2005-04-01	51549741335.12770000
2005-07-01	43942397691.46940600
2005-10-01	48762902487.92560000
2006-01-01	51531052625.78600000
2006-04-01	55497130736.07979600
2006-07-01	49452343380.56360000
2006-10-01	57293924077.37560000
2007-01-01	61544801434.63580000
2007-04-01	63706559494.48939500
2007-07-01	58964836415.18250000
2007-10-01	69172423904.06361000
2008-01-01	73645285935.52900000
2008-04-01	79943946270.41750000
2008-07-01	70488794870.45240000
2008-10-01	57848492144.99240000
2009-01-01	50602224811.19860000
2009-04-01	56082862107.57320000
2009-07-01	56167590631.19570000
2009-10-01	64454525674.65480000
2010-01-01	61861919682.12860000
2010-04-01	61769721356.60910000
2010-07-01	59489688662.61999500
2010-10-01	71344561240.36550000
2011-01-01	76548904424.47470000
2011-04-01	81187443222.53030000
2011-07-01	73778234703.72139000
2011-10-01	74877464924.27840000
2012-01-01	75148302404.15860000
2012-04-01	74067047242.63110000
2012-07-01	68959905675.73650000
2012-10-01	77390493423.87961000
2013-01-01	78861183921.85240000
2013-04-01	81841107765.02460000
2013-07-01	75518191998.02060000
2013-10-01	81491646359.82570000
2014-01-01	82697293888.86040000
2014-04-01	85137005368.97860000
2014-07-01	78416656425.17290000
2014-10-01	78234346170.93881000
2015-01-01	70525606202.81080000
2015-04-01	72512932080.12220000
2015-07-01	68170731350.62919600
2015-10-01	71203173473.91049000
2016-01-01	69369855167.88260000
2016-04-01	77496610372.02820000
2016-07-01	69693356645.56079000
2016-10-01	73286788356.48221000
2017-01-01	77115326264.06530000
2017-04-01	79240029031.12660000
2017-07-01	76924671180.12030000
2017-10-01	85934525045.10610000
2018-01-01	89508619247.22720000
2018-04-01	90821701516.52539000