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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)	$ 110,037,462	$ (193,443,975)	$ 98,732,182
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Unrealized (gain) loss on open futures contracts	122,742,937	(18,286,173)	63,973,835
(Increase) decrease in dividends receivable	(61,099)	(2,090)	(14,212)
(Increase) decrease in interest receivable	1,903	(11,573)	0
(Increase) decrease in directors' fees and insurance receivable	0	0	26,732
(Increase) decrease in prepaid registration fees	83,258	29,526	404,792
(Increase) decrease in ETF transaction fees receivable	1,000	0	0
Increase (decrease) in payable due to Broker	0	(44,770,339)	3,906,389
Increase (decrease) in General Partner management fees payable	(131,834)	9,112	53,400
Increase (decrease) in professional fees payable	(28,822)	455,541	(713,180)
Increase (decrease) in brokerage commissions payable	(36,500)	(12,400)	1,450
Increase (decrease) in directors' fees and insurance payable	(7,947)	2,928	5,417
Increase (decrease) in license fees payable	(8,116)	(7,138)	(1,954)
Net cash provided by (used in) operating activities	232,592,242	(256,036,581)	166,374,851
Cash Flows from Financing Activities:
Addition of partnership shares	1,744,841,011	1,786,316,120	726,382,450
Redemption of partnership shares	(2,269,580,373)	(1,446,127,327)	(803,743,255)
Net cash provided by (used in) financing activities	(524,739,362)	340,188,793	(77,360,805)
Net Increase (Decrease) in Cash and Cash Equivalents	(292,147,120)	84,152,212	89,014,046
Total Cash, Cash Equivalents and Equity in Trading Accounts, beginning of year	651,938,294	567,786,082	478,772,036
Total Cash, Cash Equivalents and Equity in Trading Accounts, end of year	$ 359,791,174	$ 651,938,294	$ 567,786,082

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