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Condensed Statements of Cash Flows - USD ($)	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Cash Flows from Operating Activities:
Net income (loss)	$ (152,131,287)	$ 16,489,055
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
(Increase) decrease in commodity futures trading account - cash and cash equivalents	(43,915,357)	(33,277,614)
Unrealized (gain) loss on open futures contracts	56,069,637	119,737,962
(Increase) decrease in dividends receivable	559	(10,957)
(Increase) decrease in interest receivable	(25,774)	0
(Increase) decrease in directors' fees and insurance receivable	(1,445)	24,839
(Increase) decrease in prepaid registration fees	(12,112)	303,041
(Increase) decrease in ETF transaction fees receivable	0	1,000
Increase (decrease) in payable due to Broker	(44,770,339)	(40,863,950)
Increase (decrease) in General Partner management fees payable	(62,879)	29,212
Increase (decrease) in professional fees payable	(17,873)	(791,729)
Increase (decrease) in brokerage commissions payable	(12,400)	1,450
Increase (decrease) in directors' fees and insurance payable	(5,417)	0
Increase (decrease) in license fees payable	(11,594)	(3,513)
Net cash provided by (used in) operating activities	(184,896,281)	61,638,796
Cash Flows from Financing Activities:
Addition of partnership shares	1,211,520,273	357,303,689
Redemption of partnership shares	(1,107,715,873)	(348,826,140)
Net cash provided by (used in) financing activities	103,804,400	8,477,549
Net Increase (Decrease) in Cash and Cash Equivalents	(81,091,881)	70,116,345
Cash and Cash Equivalents, beginning of period	522,819,857	453,830,484
Cash and Cash Equivalents, end of period	$ 441,727,976	$ 523,946,829

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