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Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash Flows from Operating Activities:
Net income (loss)	$ (291,274,645)	$ 78,972,397	$ 666,552,810
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Unrealized (gain) loss on open futures contracts	312,173,308	(6,489,790)	(249,798,620)
(Increase) decrease in dividends receivable	10,305	68,612	(214,021)
(Increase) decrease in interest receivable	3,152	(32,182)	0
(Increase) decrease in prepaid registration fees	349,290	348,425	(550,777)
(Increase) decrease in ETF transaction fees receivable	0	3,000	0
Increase (decrease) in payable due to Broker	(57,283,329)	(53,495,599)	110,778,928
Increase (decrease) in General Partner management fees payable	(215,644)	(456,590)	77,120
Increase (decrease) in professional fees payable	(317,442)	229,229	623,632
Increase (decrease) in brokerage commissions payable	(98,000)	(48,000)	(25,000)
Increase (decrease) in directors' fees and insurance payable	(10,539)	(4,328)	(16,747)
Increase (decrease) in license fees payable	(21,487)	(75,801)	36,323
Net cash provided by (used in) operating activities	(36,685,031)	19,019,373	527,463,648
Cash Flows from Financing Activities:
Addition of partnership shares	3,988,747,637	4,138,684,744	4,489,405,734
Redemption of partnership shares	(4,286,383,585)	(5,336,829,913)	(5,123,398,604)
Net cash provided by (used in) financing activities	(297,635,948)	(1,198,145,169)	(633,992,870)
Net Increase (Decrease) in Cash and Cash Equivalents	(334,320,979)	(1,179,125,796)	(106,529,222)
Total Cash, Cash Equivalents and Equity in Trading Accounts, beginning of year	1,991,256,955	3,170,382,751	3,276,911,973
Total Cash, Cash Equivalents and Equity in Trading Accounts, end of year	$ 1,656,935,976	$ 1,991,256,955	$ 3,170,382,751

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