Quarter	US Dollars, monthly level
1999-01-01	-29424330890.601200
1999-04-01	-41198551417.291900
1999-07-01	-53880134151.332596
1999-10-01	-52159758033.113200
2000-01-01	-70216468749.389190
2000-04-01	-79556265945.195710
2000-07-01	-97082578116.287100
2000-10-01	-102151875788.945000
2001-01-01	-71103368675.900600
2001-04-01	-71011078246.159500
2001-07-01	-76779748708.955600
2001-10-01	-63704008373.032500
2002-01-01	-47270802284.113010
2002-04-01	-59155968757.313700
2002-07-01	-76490486003.057100
2002-10-01	-90120730194.061200
2003-01-01	-91526757533.371600
2003-04-01	-91123598879.658310
2003-07-01	-85255598544.015990
2003-10-01	-85286378676.050000
2004-01-01	-71097186680.059100
2004-04-01	-99064001703.795000
2004-07-01	-135375892304.359010
2004-10-01	-148451484522.067020
2005-01-01	-131086550832.868990
2005-04-01	-148688942863.397000
2005-07-01	-184045881151.667000
2005-10-01	-191576963549.952030
2006-01-01	-167898153972.073000
2006-04-01	-181025879223.270020
2006-07-01	-229989574326.298000
2006-10-01	-183698802336.212980
2007-01-01	-169901228418.449980
2007-04-01	-185280529862.304020
2007-07-01	-217844448981.438020
2007-10-01	-233731685617.960020
2008-01-01	-204419863172.042000
2008-04-01	-232251936121.695980
2008-07-01	-301866430131.034000
2008-10-01	-234698280830.852020
2009-01-01	-127538490050.570000
2009-04-01	-75554200934.244900
2009-07-01	-123824334076.878000
2009-10-01	-114156279507.182000
2010-01-01	-115764349116.267000
2010-04-01	-143408168671.868000
2010-07-01	-177703656150.721000
2010-10-01	-146360779331.347020
2011-01-01	-171212615594.598000
2011-04-01	-215843003046.813020
2011-07-01	-228870611764.649000
2011-10-01	-195518048798.628000
2012-01-01	-189296118648.006000
2012-04-01	-184272576080.264980
2012-07-01	-209188975923.707000
2012-10-01	-183835858615.755980
2013-01-01	-151583669833.958980
2013-04-01	-139007048082.879000
2013-07-01	-198646118412.211980
2013-10-01	-153261629469.345000
2014-01-01	-157649475316.811980
2014-04-01	-159923327138.361000
2014-07-01	-201247340530.313020
2014-10-01	-140774624594.555000
2015-01-01	-125628306710.636000
2015-04-01	-122475371743.282000
2015-07-01	-171190091597.787000
2015-10-01	-137254098870.548000
2016-01-01	-110087987228.136000
2016-04-01	-88392902804.589800
2016-07-01	-151510578521.241000
2016-10-01	-104206847400.949000
2017-01-01	-119324282909.196990
2017-04-01	-124440441379.558000
2017-07-01	-159389194268.759000
2017-10-01	-157063655602.725000
2018-01-01	-160152962818.271000
2018-04-01	-151334262503.708980