Quarter	US Dollars, monthly level
1991-01-01	-334115793.66628504
1991-04-01	204675328.19738200
1991-07-01	159874049.19678798
1991-10-01	-657185876.30354300
1992-01-01	11516860.87563400
1992-04-01	-435379084.29879600
1992-07-01	-781109608.00010400
1992-10-01	-1584466043.58209010
1993-01-01	-985424906.16018890
1993-04-01	-1877106229.73846000
1993-07-01	-573433263.41292500
1993-10-01	-1167892249.27495000
1994-01-01	-675918350.89826200
1994-04-01	-1099974304.66949000
1994-07-01	-928184755.85287890
1994-10-01	-1598457363.81184000
1995-01-01	-903369105.60022900
1995-04-01	-1705801785.31618000
1995-07-01	-1392049049.73382000
1995-10-01	-2168112642.22635030
1996-01-01	-2240763505.19347000
1996-04-01	-3267264550.07657960
1996-07-01	-2925518296.69085000
1996-10-01	-4232176067.66701000
1997-01-01	-3623404574.53244000
1997-04-01	-4230013047.19485040
1997-07-01	-3938304406.43275000
1997-10-01	-4748219011.81817100
1998-01-01	-4071212428.09065000
1998-04-01	-4647086621.11527100
1998-07-01	-4681990874.49546000
1998-10-01	-5021537350.35781000
1999-01-01	-3852657877.60102000
1999-04-01	-4442381055.23914000
1999-07-01	-4754533521.57819900
1999-10-01	-5440238954.52646000
2000-01-01	-4243142918.21656040
2000-04-01	-4741083562.26520100
2000-07-01	-3972181157.71255970
2000-10-01	-4335662705.63657000
2001-01-01	-3252883870.70476000
2001-04-01	-3781772036.11243960
2001-07-01	-3339387340.89537000
2001-10-01	-3828343253.06691000
2002-01-01	-2849512052.89853000
2002-04-01	-3840984734.15200000
2002-07-01	-3587730395.97198000
2002-10-01	-3819605316.57419000
2003-01-01	-3296949151.03780030
2003-04-01	-3409511453.22491000
2003-07-01	-3816616652.24591000
2003-10-01	-3923526926.58173000
2004-01-01	-2940209974.63202000
2004-04-01	-4911856565.90381050
2004-07-01	-3455324990.58302000
2004-10-01	-3251369286.43612000
2005-01-01	-2553263974.53638000
2005-04-01	-3094347847.12995000
2005-07-01	-3238064072.43443970
2005-10-01	-3268241852.47961000
2006-01-01	-3007878820.37128000
2006-04-01	-3650390712.35533000
2006-07-01	-4278243312.00874040
2006-10-01	-5338488047.67862000
2007-01-01	-4936004105.45680000
2007-04-01	-6235043992.93684000
2007-07-01	-6187213112.11381000
2007-10-01	-8332856716.32173900
2008-01-01	-8520000729.04452000
2008-04-01	-10493597491.10310000
2008-07-01	-10128229965.23980000
2008-10-01	-9097855854.11228000
2009-01-01	-3068057121.41581000
2009-04-01	-3080516662.65289970
2009-07-01	-3470626238.73734000
2009-10-01	-3295328806.04096000
2010-01-01	-3546114799.72649000
2010-04-01	-3538413078.14082000
2010-07-01	-4789632940.97384100
2010-10-01	-6482074743.27944000
2011-01-01	-4728411519.65658000
2011-04-01	-6674085108.90792000
2011-07-01	-5308226247.21448000
2011-10-01	-5203511857.09157900
2012-01-01	-4525021976.31729000
2012-04-01	-3927317544.04396000
2012-07-01	-1907797900.10468000
2012-10-01	-3411119149.76022960
2013-01-01	-1454857060.70649980
2013-04-01	384045993.33083500
2013-07-01	73689832.35067101
2013-10-01	-1663228521.20150020
2014-01-01	-661547045.31795610
2014-04-01	-668891074.48585810
2014-07-01	-975069365.78268400
2014-10-01	-1176982127.80577000
2015-01-01	1432475838.87624000
2015-04-01	752184248.67254000
2015-07-01	-563054547.47519300
2015-10-01	736688180.13994600
2016-01-01	1282147303.99327000
2016-04-01	2003786296.01596000
2016-07-01	56244543.34425930
2016-10-01	975434558.52695110
2017-01-01	772240881.00777300
2017-04-01	292109906.72447000
2017-07-01	519369519.46459997
2017-10-01	-1001255343.06748000
2018-01-01	-1366656973.11365000
2018-04-01	-100830423.80321200