Quarter	US Dollars, monthly level
1960-01-01	468797988.80924803
1960-04-01	435809129.17768800
1960-07-01	415291165.52382700
1960-10-01	490453630.32435703
1961-01-01	465504762.43242600
1961-04-01	439507688.75014603
1961-07-01	441958546.62324700
1961-10-01	526458437.31235600
1962-01-01	511377513.54000000
1962-04-01	512047529.17622100
1962-07-01	554383275.50066300
1962-10-01	553859755.05074800
1963-01-01	490513323.45947300
1963-04-01	545246686.24848810
1963-07-01	521039933.58750900
1963-10-01	572703706.39453300
1964-01-01	602565521.24425300
1964-04-01	686749146.29999700
1964-07-01	611834319.60243090
1964-10-01	712468908.48958400
1965-01-01	705347091.27374590
1965-04-01	727083612.71855310
1965-07-01	658847736.18345500
1965-10-01	728247159.96050310
1966-01-01	740285932.74213600
1966-04-01	740014250.20218100
1966-07-01	700986927.32616290
1966-10-01	821003972.10698090
1967-01-01	775055742.33110600
1967-04-01	804856128.53749900
1967-07-01	737547909.38093400
1967-10-01	821749099.89106800
1968-01-01	780530161.07771300
1968-04-01	797497236.79026000
1968-07-01	765937214.31423400
1968-10-01	898994366.87902100
1969-01-01	876953267.56580010
1969-04-01	959144125.92988900
1969-07-01	925089175.33294600
1969-10-01	1042465434.87728990
1970-01-01	1018675458.98543010
1970-04-01	1157514858.13020000
1970-07-01	1012815155.05319010
1970-10-01	1218535160.87369010
1971-01-01	1134675894.71800000
1971-04-01	1165988894.83674000
1971-07-01	1069343805.57315990
1971-10-01	1250381823.39455000
1972-01-01	1204681232.88089010
1972-04-01	1194496043.34105010
1972-07-01	1230870849.50953980
1972-10-01	1438790785.16409000
1973-01-01	1650187452.15678000
1973-04-01	1897689265.82316020
1973-07-01	1949430772.26554000
1973-10-01	2324908384.02004000
1974-01-01	2494418098.67528000
1974-04-01	2591315140.54241000
1974-07-01	2344652384.74833970
1974-10-01	2511603846.53980970
1975-01-01	2477416294.69689000
1975-04-01	2586586669.68332000
1975-07-01	2339626849.18378970
1975-10-01	2973405114.79665000
1976-01-01	2961147251.76898000
1976-04-01	2533323183.17078970
1976-07-01	2959710742.33403970
1976-10-01	3485248038.39308000
1977-01-01	3408833562.30708000
1977-04-01	3265644986.36828000
1977-07-01	3180990319.74377970
1977-10-01	3414439533.47976970
1978-01-01	3444431698.63620000
1978-04-01	3490523333.24699000
1978-07-01	3461252705.75629000
1978-10-01	4199798000.68174030
1979-01-01	4268707800.26068000
1979-04-01	4389469524.34181000
1979-07-01	4578269081.85038000
1979-10-01	5198921311.72835000
1980-01-01	5447016418.30709900
1980-04-01	4786832372.11368900
1980-07-01	4477598436.99653000
1980-10-01	4660089484.62090000
1981-01-01	4625229264.53717000
1981-04-01	4320364557.74994000
1981-07-01	3897702811.45986000
1981-10-01	4732891637.93561000
1982-01-01	4477525779.65999000
1982-04-01	4221981427.40999000
1982-07-01	3761432465.58796000
1982-10-01	4218155900.93841030
1983-01-01	4117381003.27827020
1983-04-01	4091589030.11876960
1983-07-01	3689690842.22768970
1983-10-01	4365656038.28908000
1984-01-01	4305260926.69954000
1984-04-01	4271704296.20240970
1984-07-01	3777245519.07330000
1984-10-01	4260702777.60000000
1985-01-01	4130699090.37916000
1985-04-01	4203749476.17528960
1985-07-01	4357758753.29454000
1985-10-01	5556676081.04511000
1986-01-01	5354144108.13058950
1986-04-01	5900911742.21118100
1986-07-01	5484038079.30898000
1986-10-01	6145868260.31303000
1987-01-01	6031305972.45203000
1987-04-01	6235217016.11943900
1987-07-01	5871160476.79904000
1987-10-01	7397216465.78259000
1988-01-01	6783100951.95462000
1988-04-01	7086447987.31956000
1988-07-01	6084669948.91612000
1988-10-01	7309191492.06705000
1989-01-01	6559211487.67492000
1989-04-01	7128978618.84408950
1989-07-01	6668385995.95312000
1989-10-01	7662219706.92686000
1990-01-01	7657370621.69254000
1990-04-01	8081980225.60055000
1990-07-01	7915448713.09394000
1990-10-01	9604639560.53750000
1991-01-01	8642039769.17457000
1991-04-01	8442326835.54250900
1991-07-01	8001031283.96214000
1991-10-01	8990922613.64584000
1992-01-01	8725720932.63302000
1992-04-01	8791453121.57407000
1992-07-01	9071551669.99984000
1992-10-01	8918424058.09973000
1993-01-01	8162907616.84268100
1993-04-01	7745936756.34923000
1993-07-01	7269499594.82327100
1993-10-01	8165274000.08430100
1994-01-01	8244157752.87914000
1994-04-01	8794355180.81574000
1994-07-01	9108135769.79462000
1994-10-01	10449341724.33010100
1995-01-01	11336881007.12380000
1995-04-01	11401998076.12310000
1995-07-01	10736514970.02929900
1995-10-01	12259861564.27890000
1996-01-01	11281379317.15610000
1996-04-01	10877945258.73580000
1996-07-01	10896175870.28100000
1996-10-01	11963994275.47230100
1997-01-01	10834611379.55830000
1997-04-01	11234898726.80040000
1997-07-01	10498763104.04790000
1997-10-01	11840868931.25080000
1998-01-01	11673851130.04600000
1998-04-01	10912668099.35039900
1998-07-01	11224896214.63620000
1998-10-01	12529484334.98470000
1999-01-01	11449279397.72000000
1999-04-01	10713534362.94400000
1999-07-01	10641617548.11680000
1999-10-01	11690136002.15840000
2000-01-01	11437386727.36950000
2000-04-01	10868798584.74500000
2000-07-01	10649604996.98029900
2000-10-01	11373092351.69369900
2001-01-01	11359822806.45840000
2001-04-01	10754348901.01360000
2001-07-01	10604968235.64120100
2001-10-01	11416969222.40380100
2002-01-01	10967050222.41980000
2002-04-01	12136195195.37940000
2002-07-01	12508696438.00220100
2002-10-01	13344459151.34720000
2003-01-01	13712996273.30330000
2003-04-01	13625971659.57300000
2003-07-01	13341643393.72440000
2003-10-01	15629084384.22060000
2004-01-01	15907788691.64440000
2004-04-01	16161524375.27119800
2004-07-01	16449203545.63730000
2004-10-01	18407857865.19850000
2005-01-01	17337833238.25660000
2005-04-01	18624179382.48480200
2005-07-01	17798731694.18129700
2005-10-01	18956857518.45150000
2006-01-01	19481068198.27729800
2006-04-01	20825574200.39780000
2006-07-01	20680899108.57330000
2006-10-01	23226150726.53540000
2007-01-01	23522478576.28790000
2007-04-01	23318262636.05820000
2007-07-01	23604161154.41020000
2007-10-01	26917038437.57900000
2008-01-01	27569739972.73900200
2008-04-01	29940439236.44159700
2008-07-01	27835947417.46480000
2008-10-01	23635519239.29160000
2009-01-01	19619701884.70490000
2009-04-01	18756967858.93250300
2009-07-01	19994229325.03640000
2009-10-01	21749969752.90270000
2010-01-01	20026249746.13680000
2010-04-01	19930387623.67950000
2010-07-01	20337454456.76810000
2010-10-01	22457758161.30480000
2011-01-01	22872042884.93499800
2011-04-01	24697533380.20030200
2011-07-01	24635958381.10670000
2011-10-01	24003858612.34750000
2012-01-01	23025434117.23450000
2012-04-01	22570361460.19439700
2012-07-01	21971359338.44450000
2012-10-01	23797402622.00730000
2013-01-01	23555939023.53120000
2013-04-01	23542711973.65320200
2013-07-01	24708425487.07370000
2013-10-01	25428311687.15660000
2014-01-01	25089864480.74140000
2014-04-01	25343140269.46510000
2014-07-01	24675037756.08049800
2014-10-01	23812292672.42580000
2015-01-01	21715875643.65659700
2015-04-01	21061449289.48920000
2015-07-01	21048624666.61549800
2015-10-01	21417426267.86580000
2016-01-01	20291986581.76840000
2016-04-01	21264007114.70170000
2016-07-01	20942051418.63610000
2016-10-01	21944388199.45969800
2017-01-01	21463493643.24860000
2017-04-01	21981132442.27570000
2017-07-01	23620940209.79240000
2017-10-01	25078257935.24110000
2018-01-01	26145776369.56720000
2018-04-01	27006395338.96400000
2018-07-01	23728730789.38290000