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Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash Flows from Operating Activities:
Net income (loss)	$ 473,455,704	$ (291,274,645)	$ 78,972,397
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Unrealized (gain) loss on open futures contracts	(231,913,525)	312,173,308	(6,489,790)
(Increase) decrease in dividends receivable	138,151	10,305	68,612
(Increase) decrease in interest receivable	831	3,152	(32,182)
(Increase) decrease in prepaid insurance	(7,571)	(5,114)	1,590
(Increase) decrease in prepaid registration fees	504,876	349,290	348,425
(Increase) decrease in ETF transaction fees receivable	0	0	3,000
Increase (decrease) in payable due to Broker	8,820,649	(57,283,329)	(53,495,599)
Increase (decrease) in General Partner management fees payable	(116,084)	(215,644)	(456,590)
Increase (decrease) in professional fees payable	(287,285)	(317,442)	229,229
Increase (decrease) in brokerage commissions payable	0	(98,000)	(48,000)
Increase (decrease) in directors' fees payable	441	(5,425)	(5,918)
Increase (decrease) in license fees payable	(13,869)	(21,487)	(75,801)
Net cash provided by (used in) operating activities	250,582,318	(36,685,031)	19,019,373
Cash Flows from Financing Activities:
Addition of partnership shares	3,218,764,872	3,988,747,637	4,138,684,744
Redemption of partnership shares	(3,950,037,755)	(4,286,383,585)	(5,336,829,913)
Net cash provided by (used in) financing activities	(731,272,883)	(297,635,948)	(1,198,145,169)
Net Increase (Decrease) in Cash and Cash Equivalents	(480,690,565)	(334,320,979)	(1,179,125,796)
Total Cash, Cash Equivalents and Equity in Trading Accounts, beginning of year	1,656,935,976	1,991,256,955	3,170,382,751
Total Cash, Cash Equivalents and Equity in Trading Accounts, end of year	$ 1,176,245,411	$ 1,656,935,976	$ 1,991,256,955

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