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Condensed Statements of Cash Flows - USD ($)		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018
Cash Flows from Operating Activities:
Net income (loss)		$ (25,187,996)	$ 50,003,562
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Unrealized (gain) loss on open futures contracts		(30,374,062)	35,120,220
(Increase) decrease in dividends receivable		8,143	5,866
(Increase) decrease in interest receivable		1,841	7,247
(Increase) decrease in prepaid insurance	[1]	(7,104)	4,558
(Increase) decrease in prepaid registration fees		(461,476)	68,542
(Increase) decrease in ETF transaction fees receivable		1,000	2,000
Increase (decrease) in payable due to Broker		0	15,986,912
Increase (decrease) in General Partner management fees payable		(29,620)	(195,202)
Increase (decrease) in professional fees payable		(237,165)	(253,479)
Increase (decrease) in brokerage commissions payable		0	(12,500)
Increase (decrease) in directors' fees payable	[1]	(344)	(4,282)
Increase (decrease) in insurance payable	[1]	0	16,932
Increase (decrease) in license fees payable		(3,480)	(9,843)
Net cash provided by (used in) operating activities		(56,290,263)	100,740,533
Cash Flows from Financing Activities:
Addition of partnership shares		533,947,245	1,050,763,122
Redemption of partnership shares		(543,775,338)	(1,501,863,094)
Net cash provided by (used in) financing activities		(9,828,093)	(451,099,972)
Net Increase (Decrease) in Cash and Cash Equivalents		(66,118,356)	(350,359,439)
Total Cash, Cash Equivalents and Equity in Trading Accounts, beginning of period		359,791,174	651,938,294
Total Cash, Cash Equivalents and Equity in Trading Accounts, end of period		$ 293,672,818	$ 301,578,855
[1] Certain prior year amounts have been reclassified for consistency with the current presentation.

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