Quarter	US Dollars, monthly level
1988-01-01	-172942233.71831500
1988-04-01	-227672257.25742100
1988-07-01	-222687811.89798400
1988-10-01	-121100710.31774800
1989-01-01	-220081454.30774600
1989-04-01	-129177930.18975398
1989-07-01	-210024514.45077598
1989-10-01	-258582439.28821800
1990-01-01	-238115693.95888000
1990-04-01	-296702503.09335900
1990-07-01	-380789011.83375400
1990-10-01	-377433191.78602403
1991-01-01	-444356385.42376596
1991-04-01	-368754945.27155000
1991-07-01	-449539879.43588200
1991-10-01	-513293458.92577904
1992-01-01	-419801072.59479296
1992-04-01	-391195223.43981400
1992-07-01	-416793822.22988796
1992-10-01	-524755568.60536397
1993-01-01	-464697663.00389500
1993-04-01	-383386773.54709400
1993-07-01	-330006358.77628900
1993-10-01	-624764128.58176000
1994-01-01	-418819557.63821700
1994-04-01	-453130357.53249600
1994-07-01	-477061485.09532195
1994-10-01	-518938536.24172900
1995-01-01	-522630846.09714100
1995-04-01	-559747865.71249900
1995-07-01	-552143280.09428800
1995-10-01	-541514643.69455910
1996-01-01	-660706851.98333500
1996-04-01	-617591616.34557000
1996-07-01	-532610315.31619096
1996-10-01	-614680043.02865990
1997-01-01	-558437711.33012000
1997-04-01	-485012369.82912400
1997-07-01	-656728646.61412000
1997-10-01	-686874097.47167800
1998-01-01	-459597708.80511504
1998-04-01	-503775593.08237195
1998-07-01	-527945922.83655596
1998-10-01	-823146557.42037800
1999-01-01	-807866479.66143000
1999-04-01	-593259566.79909000
1999-07-01	-640001983.21305800
1999-10-01	-973016727.93543500
2000-01-01	-588310843.10400300
2000-04-01	-658199768.86199400
2000-07-01	-738038271.05879600
2000-10-01	-889051066.55302200
2001-01-01	-575272011.87049300
2001-04-01	-744834021.36566200
2001-07-01	-704412461.31101900
2001-10-01	-543221601.20969300
2002-01-01	-495032586.26460200
2002-04-01	-426793112.84913800
2002-07-01	-697336621.70305700
2002-10-01	-839191709.42699100
2003-01-01	-663115518.27412300
2003-04-01	-1050131731.37529000
2003-07-01	-627216092.74284490
2003-10-01	-519035368.14219200
2004-01-01	-924360785.95078100
2004-04-01	-1093278841.69325000
2004-07-01	-884729270.35318410
2004-10-01	-883593909.87899100
2005-01-01	-978257544.78356200
2005-04-01	-851382660.37157100
2005-07-01	-763285610.03884400
2005-10-01	-846110270.90487500
2006-01-01	-786454482.16089700
2006-04-01	-1099523037.69542000
2006-07-01	-953996881.96783200
2006-10-01	-1285647319.68517020
2007-01-01	-1165843731.58698000
2007-04-01	-1261666854.24035000
2007-07-01	-1342703433.71403000
2007-10-01	-1327783860.36642000
2008-01-01	-1440226817.89713000
2008-04-01	-1853069514.61345980
2008-07-01	-1602525853.69805000
2008-10-01	-1547020122.18160000
2009-01-01	-1022502409.91643990
2009-04-01	-1323283290.10905000
2009-07-01	-373340595.38796700
2009-10-01	-1245138540.62410000
2010-01-01	-1371314481.13627000
2010-04-01	-1785822769.49142000
2010-07-01	-1129896220.87331000
2010-10-01	-1713481285.43071000
2011-01-01	-1404277302.20274000
2011-04-01	-1938301504.71977000
2011-07-01	-2212830262.22192000
2011-10-01	-2427076036.52366000
2012-01-01	-1691064333.88180020
2012-04-01	-2201543779.65829000
2012-07-01	-2360542676.11547000
2012-10-01	-2177844191.02213000
2013-01-01	-2221765169.73833000
2013-04-01	-2174767615.89913000
2013-07-01	-2208781079.64841030
2013-10-01	-1631158651.93532010
2014-01-01	-1849616561.66516020
2014-04-01	-1775504528.36599000
2014-07-01	-1927578176.62670000
2014-10-01	-1991710313.97506000
2015-01-01	-1794300349.35482000
2015-04-01	-1480555501.22409000
2015-07-01	-1685666806.59019020
2015-10-01	-1205779978.62115000
2016-01-01	-1270760469.39801980
2016-04-01	-1293518550.30058000
2016-07-01	-1350205287.86687000
2016-10-01	-2034229621.96872000
2017-01-01	-1635949814.26540020
2017-04-01	-1836517528.95974000
2017-07-01	-1497710412.03748000
2017-10-01	-1935838869.24467000
2018-01-01	-1968416167.86648000
2018-04-01	-1810635232.75613000