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Condensed Statements of Operations - USD ($)		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Gain (loss) on trading of commodity futures contracts:
Realized gain (loss) on closed futures contracts		$ 120,333,820	$ 135,353,709	$ 451,011,820	$ (257,378,501)
Change in unrealized gain (loss) on open futures contracts		(77,520,980)	128,797,560	8,329,350	11,252,100
Dividend income		723,714	988,616	1,494,267	2,883,444
Interest income	[1]	7,988,050	5,365,328	21,631,092	12,400,479
ETF transaction fees		77,000	110,000	273,000	268,000
Total income (loss)		51,601,604	270,615,213	482,739,529	(230,574,478)
Expenses
General Partner management fees (Note 3)		1,984,921	2,943,845	6,293,684	9,401,948
Professional fees		409,589	336,088	1,379,811	1,521,840
Brokerage commissions		570,108	1,248,593	1,916,737	3,775,114
Directors' fees and insurance		80,559	90,856	236,202	271,193
License fees		66,164	98,128	209,789	313,398
Registration fees		5,963	87,822	93,326	260,603
Total expenses		3,117,304	4,805,332	10,129,549	15,544,096
Net income (loss)		$ 48,484,300	$ 265,809,881	$ 472,609,980	$ (246,118,574)
Net income (loss) per limited partnership share		$ 0.45	$ 0.97	$ 3.39	$ (1.27)
Net income (loss) per weighted average limited partnership share		$ 0.40	$ 1.00	$ 3.41	$ (0.91)
Weighted average limited partnership shares outstanding		121,141,304	264,872,826	138,401,832	271,439,560
[1] Interest income does not exceed paid in kind of 5%.

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