Quarter	US Dollars, monthly level
1960-01-01	30946224.651008800
1960-04-01	21259842.519718400
1960-07-01	15748031.496087702
1960-10-01	28608923.884559300
1961-01-01	16010498.687689101
1961-04-01	20209973.753312500
1961-07-01	21393087.591898600
1961-10-01	23223409.196487002
1962-01-01	15559684.161646299
1962-04-01	25545750.116135700
1962-07-01	19972131.908978797
1962-10-01	28332559.219714100
1963-01-01	19739897.817013900
1963-04-01	32745006.967046604
1963-07-01	26242452.392030300
1963-10-01	31351602.415257398
1964-01-01	21597770.552732900
1964-04-01	42034370.645641400
1964-07-01	28100325.127749197
1964-10-01	39015327.450098100
1965-01-01	22991175.104522098
1965-04-01	42731072.921536000
1965-07-01	31351602.415257398
1965-10-01	40408732.001887300
1966-01-01	30190431.955433100
1966-04-01	48072457.036728000
1966-07-01	35764050.162590005
1966-10-01	45053413.841184700
1967-01-01	29958197.863468200
1967-04-01	52949372.967990300
1967-07-01	37157454.714379200
1967-10-01	41917826.324728794
1968-01-01	24356053.968801100
1968-04-01	40301384.264922604
1968-07-01	37848256.527057800
1968-10-01	32985848.959819097
1969-01-01	22928490.351888400
1969-04-01	30987514.188443200
1969-07-01	32349602.724198997
1969-10-01	37003405.221364500
1970-01-01	26787741.203196403
1970-04-01	37457434.733283000
1970-07-01	38479001.135099900
1970-10-01	54483541.430229895
1971-01-01	40068104.426814910
1971-04-01	59023836.549415700
1971-07-01	50117820.509879600
1971-10-01	60741249.142058800
1972-01-01	43582704.186674900
1972-04-01	66117593.228079006
1972-07-01	53992221.459607800
1972-10-01	68694086.594274500
1973-01-01	55959595.420533000
1973-04-01	97044420.721983610
1973-07-01	73153766.529373700
1973-10-01	124582338.973038000
1974-01-01	97104106.710898400
1974-04-01	157579352.871208000
1974-07-01	116775535.878667000
1974-10-01	155219233.325242000
1975-01-01	104009258.262846010
1975-04-01	137475604.054539020
1975-07-01	109761289.305803000
1975-10-01	133663911.476730020
1976-01-01	92705880.011189600
1976-04-01	113783994.707808000
1976-07-01	118448274.962652010
1976-10-01	143107285.818105000
1977-01-01	112948123.087779000
1977-04-01	169663005.763422000
1977-07-01	144639754.358746000
1977-10-01	178236763.325899000
1978-01-01	146338918.212011000
1978-04-01	184457815.284619000
1978-07-01	162268982.733961020
1978-10-01	182944663.615801000
1979-01-01	163900536.872364000
1979-04-01	186708362.429023000
1979-07-01	221069700.155119000
1979-10-01	242340524.492307000
1980-01-01	230230237.527445020
1980-04-01	281955425.878343000
1980-07-01	244174284.162136000
1980-10-01	245853724.542507000
1981-01-01	215311093.206687000
1981-04-01	270834592.063010040
1981-07-01	232642831.511642000
1981-10-01	307090964.775493000
1982-01-01	214384296.664508010
1982-04-01	276525304.935953000
1982-07-01	230923758.611028020
1982-10-01	226624127.887780000
1983-01-01	177601202.014298000
1983-04-01	199863659.188239000
1983-07-01	207333949.117534000
1983-10-01	232455353.712555000
1984-01-01	192148737.991251020
1984-04-01	244260055.333266000
1984-07-01	205750253.374011000
1984-10-01	198194300.934103000
1985-01-01	202850670.191398000
1985-04-01	223501704.575270000
1985-07-01	224572924.344378000
1985-10-01	253707696.303269000
1986-01-01	219508494.868480000
1986-04-01	276382605.546702000
1986-07-01	283378663.868776000
1986-10-01	339610371.690626000
1987-01-01	310707988.949972000
1987-04-01	384669704.025517000
1987-07-01	406504586.913588000
1987-10-01	488592754.400596000
1988-01-01	373711202.187631960
1988-04-01	419210439.778453000
1988-07-01	364992920.603799000
1988-10-01	437376441.472719970
1989-01-01	294799758.198841040
1989-04-01	399632345.951590960
1989-07-01	318670385.959477000
1989-10-01	385867815.661244030
1990-01-01	292165470.582854030
1990-04-01	490632485.122427050
1990-07-01	396870231.143378000
1990-10-01	481969643.836434960
1991-01-01	382520989.972138000
1991-04-01	488436209.180530000
1991-07-01	404917382.600977960
1991-10-01	437842282.211909000
1992-01-01	349568286.865620000
1992-04-01	417188126.429999950
1992-07-01	454580551.355761950
1992-10-01	462341039.102726000
1993-01-01	299168919.016310000
1993-04-01	361466374.003784000
1993-07-01	322261723.599230000
1993-10-01	365205144.218611000
1994-01-01	277578136.169632000
1994-04-01	376438432.688805000
1994-07-01	365454823.955242000
1994-10-01	451821628.425587000
1995-01-01	382489222.140482960
1995-04-01	464980635.327653000
1995-07-01	415690589.443836030
1995-10-01	493934008.997097970
1996-01-01	447411475.952654000
1996-04-01	506571447.445736000
1996-07-01	512227710.655309000
1996-10-01	572207775.040844000
1997-01-01	435668162.486265000
1997-04-01	526003704.402399960
1997-07-01	508758748.267542960
1997-10-01	547556557.438046000
1998-01-01	588345127.784572000
1998-04-01	622090763.572775000
1998-07-01	626922574.335760000
1998-10-01	637380646.921510000
1999-01-01	565086568.850338000
1999-04-01	682148065.273812000
1999-07-01	638713040.423310000
1999-10-01	627864045.638288000
2000-01-01	607965811.452456000
2000-04-01	689713651.573480000
2000-07-01	646973708.673634000
2000-10-01	630802297.696183000
2001-01-01	656603277.062135000
2001-04-01	526174524.423760000
2001-07-01	576272420.475817000
2001-10-01	514936724.887811960
2002-01-01	509207219.619617000
2002-04-01	577616997.142374000
2002-07-01	598771970.270588000
2002-10-01	589999950.933519000
2003-01-01	592786548.614386000
2003-04-01	738781167.373318000
2003-07-01	758446373.086965100
2003-10-01	738139315.426839000
2004-01-01	806519877.053844000
2004-04-01	920338946.789022000
2004-07-01	949534070.255037000
2004-10-01	1038878977.007070100
2005-01-01	1099164447.309739800
2005-04-01	1279241850.839929800
2005-07-01	1341759671.573170200
2005-10-01	1268542278.848300000
2006-01-01	1384629082.235920000
2006-04-01	1599608463.156520000
2006-07-01	1526810787.106520000
2006-10-01	1648572257.893119800
2007-01-01	1422396985.910350000
2007-04-01	1562200956.360630000
2007-07-01	1563509709.488849900
2007-10-01	1827905742.927260200
2008-01-01	1647372423.607669800
2008-04-01	1840805496.124009800
2008-07-01	1679043228.611000000
2008-10-01	939740502.745669000
2009-01-01	848269634.850261000
2009-04-01	830988059.482844000
2009-07-01	974173446.734362000
2009-10-01	949745530.080966000
2010-01-01	887568114.163529000
2010-04-01	925837426.639902000
2010-07-01	1020722093.206000000
2010-10-01	1092855644.939170000
2011-01-01	1039373089.630550000
2011-04-01	1215184158.963310000
2011-07-01	1250039603.151950100
2011-10-01	1300211381.897280000
2012-01-01	1185032894.941810100
2012-04-01	1220784840.237860000
2012-07-01	1112218758.121310000
2012-10-01	1146621367.967510000
2013-01-01	1102198677.290620000
2013-04-01	1254700245.927790200
2013-07-01	1219127865.257809900
2013-10-01	1188103165.552430000
2014-01-01	1249416019.686850000
2014-04-01	1404500105.106920000
2014-07-01	1494184062.880810000
2014-10-01	1230882435.199530000
2015-01-01	1271917573.752300000
2015-04-01	1421269593.604930000
2015-07-01	1284380937.843089800
2015-10-01	1317251010.846360000
2016-01-01	1305677396.473160000
2016-04-01	1551162149.848130000
2016-07-01	1415744290.208850000
2016-10-01	1415213197.145370000
2017-01-01	1397122860.544330000
2017-04-01	1832394712.655120100
2017-07-01	1780532840.609990100
2017-10-01	1907003512.992580000
2018-01-01	1774066321.012160000
2018-04-01	2079007945.720740300
2018-07-01	1915406475.018140000