Quarter	US Dollars, monthly level
1991-01-01	-118391773.55249001
1991-04-01	-1011612368.61782000
1991-07-01	-357800789.84102900
1991-10-01	275905165.56570600
1992-01-01	-110171416.53078100
1992-04-01	-198117573.03661400
1992-07-01	111927696.99098699
1992-10-01	-236401357.98580900
1993-01-01	-611742599.70053500
1993-04-01	-1134540429.30906990
1993-07-01	-557793017.03637490
1993-10-01	-1383050309.76120000
1994-01-01	-767445963.97590400
1994-04-01	-1069854118.72199010
1994-07-01	-947187593.58024190
1994-10-01	-1092304524.08054000
1995-01-01	-989069263.46966700
1995-04-01	-965816269.41856000
1995-07-01	-307206374.54221100
1995-10-01	-322992546.34833400
1996-01-01	-527331675.50050396
1996-04-01	-555715928.41451600
1996-07-01	-653695000.85470500
1996-10-01	-684711390.00364400
1997-01-01	-640301579.27196900
1997-04-01	-632078493.94147000
1997-07-01	-425569825.47695200
1997-10-01	-450066742.21434200
1998-01-01	-533670127.19491900
1998-04-01	-771446776.30181700
1998-07-01	-673782318.94234600
1998-10-01	-710306549.90267610
1999-01-01	-611959625.42477600
1999-04-01	-877753206.32950900
1999-07-01	-729377931.54546900
1999-10-01	-759817942.95141600
2000-01-01	-856622020.51854400
2000-04-01	-829600820.69700000
2000-07-01	-1052971981.54160010
2000-10-01	-1213661117.84897000
2001-01-01	-906981100.82211600
2001-04-01	-837558512.26807300
2001-07-01	-654384217.67035100
2001-10-01	-798333424.50695200
2002-01-01	-661347617.29114400
2002-04-01	-510109253.73781700
2002-07-01	-786512964.92974100
2002-10-01	-1319602667.96667980
2003-01-01	-967953123.41302190
2003-04-01	-1422637491.40321020
2003-07-01	-1179465336.89473000
2003-10-01	-1120894255.91320010
2004-01-01	-904286642.24125900
2004-04-01	-1914409129.74255010
2004-07-01	-1188984695.50691000
2004-10-01	-731340294.17010510
2005-01-01	-674078866.04585900
2005-04-01	-857685536.92545200
2005-07-01	-1192302330.38915000
2005-10-01	-788903099.80751300
2006-01-01	-779642735.36995400
2006-04-01	-466118370.74815500
2006-07-01	-860660684.82678100
2006-10-01	-357381254.05107800
2007-01-01	-202674256.03164798
2007-04-01	10860219.71596070
2007-07-01	-130969149.41735000
2007-10-01	-91667346.49130380
2008-01-01	404392426.57308200
2008-04-01	0.00000000
2008-07-01	-679390778.91901300
2008-10-01	-139640356.26244602
2009-01-01	720287440.08317300
2009-04-01	1471666616.83406000
2009-07-01	1336034657.20683000
2009-10-01	1811265836.79689000
2010-01-01	1902772361.15574000
2010-04-01	1841868460.00433000
2010-07-01	1449190771.20630000
2010-10-01	2128167572.03715970
2011-01-01	2988897336.09045000
2011-04-01	2428879875.60418000
2011-07-01	2322523164.34962000
2011-10-01	2141438504.48447010
2012-01-01	2167478899.44260000
2012-04-01	2520109380.07708020
2012-07-01	2124348703.54800990
2012-10-01	1717723280.50059000
2013-01-01	2160442808.18718960
2013-04-01	1944781838.34750990
2013-07-01	2369577110.37725000
2013-10-01	2272989558.52201000
2014-01-01	2692123338.52314000
2014-04-01	1739176330.37442020
2014-07-01	2397720983.51606000
2014-10-01	1534336207.14565010
2015-01-01	2974888983.65813000
2015-04-01	2062889340.04150000
2015-07-01	2167592982.58986000
2015-10-01	2339554694.20144000
2016-01-01	2836333724.92740000
2016-04-01	3237427082.14603000
2016-07-01	2463653630.14270970
2016-10-01	2238984773.75009000
2017-01-01	2652410579.67852000
2017-04-01	3099310306.67428000
2017-07-01	1996281701.25746000
2017-10-01	2033101024.91830020
2018-01-01	2580177713.02165030
2018-04-01	2565061621.09565000
2018-07-01	778414239.42591500