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Condensed Statements of Cash Flows - USD ($)	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Cash Flows from Operating Activities:
Net income (loss)	$ (41,285,033)	$ 30,431,939
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Unrealized (gain) loss on open futures contracts	(61,939,447)	60,851,805
(Increase) decrease in dividends receivable	40,061	(62,165)
(Increase) decrease in interest receivable	9,670	4,316
(Increase) decrease in directors' fees and insurance receivable	(16,493)	(16,494)
(Increase) decrease in prepaid registration fees	(496,097)	53,825
(Increase) decrease in ETF transaction fees receivable	1,000	2,000
Increase (decrease) in General Partner management fees payable	(39,220)	(130,068)
Increase (decrease) in professional fees payable	(393,667)	(426,461)
Increase (decrease) in brokerage commissions payable	0	(12,500)
Increase (decrease) in directors' fees and insurance payable	(398)	(8,345)
Increase (decrease) in license fees payable	(4,678)	(8,425)
Net cash provided by (used in) operating activities	(104,124,302)	90,679,427
Cash Flows from Financing Activities:
Addition of partnership shares	446,533,840	841,684,628
Redemption of partnership shares	(372,155,453)	(1,242,337,656)
Net cash provided by (used in) financing activities	74,378,387	(400,653,028)
Net Increase (Decrease) in Cash and Cash Equivalents	(29,745,915)	(309,973,601)
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	$ 330,045,259	$ 341,964,693

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