Quarter	US Dollars, monthly level
1999-01-01	494613600.06093603
1999-04-01	567208720.06988000
1999-07-01	586199120.07222000
1999-10-01	582832640.07180500
2000-01-01	762205600.09390400
2000-04-01	755645280.09309590
2000-07-01	889872880.10963190
2000-10-01	919912240.11333300
2001-01-01	946844080.11665100
2001-04-01	1090048960.13429000
2001-07-01	1036357920.12768010
2001-10-01	1053708240.12981990
2002-01-01	1024853797.07767010
2002-04-01	1358593429.22040000
2002-07-01	1403514166.81278000
2002-10-01	1445314388.37207000
2003-01-01	1568878202.76661000
2003-04-01	1620403329.51880000
2003-07-01	1792323324.13421000
2003-10-01	1988871351.68400000
2004-01-01	1999418232.98335000
2004-04-01	2134902511.54919000
2004-07-01	2382143897.13809000
2004-10-01	2790202948.60572960
2005-01-01	2595571066.70549960
2005-04-01	2851510698.80107980
2005-07-01	3029184963.14525030
2005-10-01	3305555345.70266000
2006-01-01	3160206374.10758970
2006-04-01	3687146425.04910040
2006-07-01	3705075164.49070020
2006-10-01	3601033842.22618000
2007-01-01	3667647721.80345000
2007-04-01	4270953888.20006000
2007-07-01	4597383221.11869050
2007-10-01	4626717897.68786050
2008-01-01	5450066584.37481000
2008-04-01	6752945752.80322000
2008-07-01	6798849502.39030000
2008-10-01	4767970814.09463000
2009-01-01	3594533921.22813000
2009-04-01	3760909180.59727000
2009-07-01	4396577202.34554000
2009-10-01	4744303209.95390000
2010-01-01	4213179972.50080970
2010-04-01	4832984162.35675000
2010-07-01	5369520349.09056000
2010-10-01	6310691009.08708000
2011-01-01	6253323699.31924900
2011-04-01	7250276435.57368000
2011-07-01	7414730738.79560000
2011-10-01	7158923772.44199000
2012-01-01	6715559376.07584000
2012-04-01	6725586278.32466000
2012-07-01	7617202994.34577900
2012-10-01	8566551957.61898000
2013-01-01	7937833362.82702100
2013-04-01	7642054711.14372000
2013-07-01	8350291929.36296000
2013-10-01	8674050338.58982000
2014-01-01	7422158985.15998900
2014-04-01	8309189976.59951000
2014-07-01	8555480106.06617900
2014-10-01	8059363477.81930000
2015-01-01	5778796759.94870000
2015-04-01	6454283775.05759000
2015-07-01	6511238417.59254000
2015-10-01	6653545121.69040000
2016-01-01	5738673228.90445000
2016-04-01	6250123625.15737000
2016-07-01	6396776741.35439000
2016-10-01	6617397695.36700000
2017-01-01	6532740313.99838000
2017-04-01	7166306107.66018000
2017-07-01	7726071099.10569000
2017-10-01	8480820373.49145000
2018-01-01	8063786238.58019100
2018-04-01	8188308639.85279100