Quarter	US Dollars, monthly level
1991-01-01	2459641467.7106700
1991-04-01	3295640738.8771000
1991-07-01	2691672231.2768000
1991-10-01	2964645366.0616403
1992-01-01	2635922792.1854700
1992-04-01	2899254354.8963500
1992-07-01	2622710611.8773003
1992-10-01	2947140517.0424500
1993-01-01	2680465486.6884100
1993-04-01	3334681885.3609300
1993-07-01	2718856794.6853200
1993-10-01	3837990860.1408000
1994-01-01	3030996982.0800304
1994-04-01	3505827555.9622500
1994-07-01	3751021494.4754300
1994-10-01	4279691760.7053500
1995-01-01	3695526733.2464200
1995-04-01	4033729671.5788903
1995-07-01	3647261294.2534204
1995-10-01	3994091889.9483800
1996-01-01	4161006328.8651500
1996-04-01	4385984795.7455810
1996-07-01	4490525103.4113000
1996-10-01	5019354808.4498005
1997-01-01	4716394963.4318200
1997-04-01	5232858615.8343710
1997-07-01	5148230718.8969310
1997-10-01	6045495237.2439100
1998-01-01	5789741512.4693590
1998-04-01	6376797530.7650700
1998-07-01	6320251079.7755790
1998-10-01	7213837774.9609500
1999-01-01	6355580877.9967190
1999-04-01	6703332212.6503510
1999-07-01	6825823897.2486600
1999-10-01	8045481304.3944300
2000-01-01	7327561496.7215100
2000-04-01	7654506710.3155590
2000-07-01	7931091378.6272000
2000-10-01	9032583602.9404890
2001-01-01	8432517710.5319600
2001-04-01	8445472271.6805400
2001-07-01	7973956520.2757600
2001-10-01	8876028724.6568200
2002-01-01	8483894750.3591090
2002-04-01	9239657585.3049700
2002-07-01	9417958065.1711710
2002-10-01	10643592295.0563000
2003-01-01	10488013278.9059000
2003-04-01	11851983616.0759010
2003-07-01	11840785061.7020990
2003-10-01	13573560827.9903010
2004-01-01	13653535851.0375000
2004-04-01	15133083883.9982000
2004-07-01	14443364346.0926000
2004-10-01	16438014988.3917000
2005-01-01	15359027021.2858000
2005-04-01	16673886930.2114000
2005-07-01	16384219911.8217000
2005-10-01	16894560167.1499000
2006-01-01	17028479561.7167020
2006-04-01	18558348196.2524000
2006-07-01	19190853173.3007970
2006-10-01	21180959854.8936000
2007-01-01	21541741448.5644040
2007-04-01	22746507972.1196000
2007-07-01	23710768463.8069000
2007-10-01	26402593892.1277000
2008-01-01	27826762638.1549000
2008-04-01	30157213617.3514000
2008-07-01	28265799832.8718000
2008-10-01	22238608633.1370000
2009-01-01	17182719695.4207000
2009-04-01	18168070511.4194030
2009-07-01	19936320971.3702000
2009-10-01	22182562088.4342000
2010-01-01	20480212408.2455980
2010-04-01	20441356558.8083000
2010-07-01	22014077835.4277000
2010-10-01	24595444648.3043020
2011-01-01	24624622852.8966000
2011-04-01	26050199721.9319000
2011-07-01	25645062913.1218030
2011-10-01	25179322816.5004000
2012-01-01	23988278703.9293980
2012-04-01	23362830932.6635970
2012-07-01	22828956626.0815000
2012-10-01	24266122708.2552000
2013-01-01	23824744991.7199000
2013-04-01	24636522045.3173000
2013-07-01	24478906229.2645000
2013-10-01	26233723885.6060000
2014-01-01	25607202296.1959000
2014-04-01	27272540759.4157030
2014-07-01	25719448446.1346970
2014-10-01	25260250103.2426000
2015-01-01	22102722695.3631000
2015-04-01	23116766270.4701000
2015-07-01	22703331983.5582000
2015-10-01	22871253050.9750000
2016-01-01	21960162243.6063000
2016-04-01	23810289319.4624000
2016-07-01	23023307646.2271000
2016-10-01	23387642248.2162970
2017-01-01	24300683574.5725980
2017-04-01	25161063807.9572000
2017-07-01	26636737370.5087000
2017-10-01	27862348684.6963000
2018-01-01	29562822581.0398000
2018-04-01	29857344483.3750000
2018-07-01	28368503494.2492000