Statements of Income and Expenses (Unaudited) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Income
Interest Income	$ 2,898,602	$ 1,493,090	$ 5,478,768	$ 2,385,493
Dividends from Affiliates	142,474		284,273
Total Income	3,041,076	1,493,090	5,763,041	2,385,493
Expenses
Management Fee	4,191,521	4,814,098	9,353,258	8,787,385
Brokerage Commissions and Fees	74,661	155,543	166,944	275,678
Interest Expense	34,884	7,358	62,945	104,245
Total Expenses	4,301,066	4,976,999	9,583,147	9,167,308
Less: Waivers	(135,535)	0	(229,185)	0
Net Expenses	4,165,531	4,976,999	9,353,962	9,167,308
Net Investment Income (Loss)	(1,124,455)	(3,483,909)	(3,590,921)	(6,781,815)
Net Realized Gain (Loss) on
United States Treasury Obligations	(12,675)	632	(42,339)	1,263
Commodity Futures Contracts	(63,372,537)	(66,087,932)	(1,182,345)	(265,281,304)
Net Realized Gain (Loss)	(63,385,212)	(66,087,300)	(1,224,684)	(265,280,041)
Net Change in Unrealized Gain (Loss) on
United States Treasury Obligations	266,321	195,958	150,092	374,068
Affiliated Investments	450,756		535,214
Commodity Futures Contracts	(42,197,634)	381,444,063	(201,066,322)	570,979,786
Net Change in Unrealized Gain (Loss)	(41,480,557)	381,640,021	(200,381,016)	571,353,854
Net Realized and Net Change in Unrealized Gain (Loss) on United States Treasury Obligations, Affiliated Investments and Commodity Futures Contracts	(104,865,769)	315,552,721	(201,605,700)	306,073,813
Net Income (Loss)	$ (105,990,224)	$ 312,068,812	$ (205,196,621)	$ 299,291,998