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Condensed Statements of Financial Condition - USD ($)
Sep. 30, 2018
Dec. 31, 2017
Assets    
Cash and cash equivalents (at cost $281,621,183 and $550,936,887, respectively) (Notes 2 and 5) $ 281,621,183 $ 550,936,887
Equity in trading accounts:    
Cash and cash equivalents (at cost $19,957,672 and $101,001,407, respectively) 19,957,672 101,001,407
Unrealized gain (loss) on open commodity futures contracts 20,601,460 55,721,680
Dividends receivable 11,178 17,044
Interest receivable 4,326 11,573
Prepaid registration fees 89,730 158,272
ETF transaction fees receivable 0 2,000
Total assets 322,285,549 707,848,863
Liabilities and Partners' Capital    
Payable due to Broker 15,986,912 0
Payable for shares redeemed 0 54,457,966
General Partner management fees payable (Note 3) 117,264 312,466
Professional fees payable 639,280 892,759
Brokerage commissions payable 60,300 72,800
Directors' fees and insurance payable 25,553 8,345
License fees payable 2,951 12,794
Total liabilities 16,832,260 55,757,130
Commitments and Contingencies (Notes 3, 4 and 5)
Partners' Capital    
General Partner 0 0
Limited Partners 305,453,289 652,091,733
Total Partners' Capital 305,453,289 652,091,733
Total liabilities and partners' capital $ 322,285,549 $ 707,848,863
Limited Partners' shares outstanding 12,284,588 27,941,619 [1]
Net asset value per share $ 24.86 $ 23.34 [1]
Market value per share $ 24.83 $ 23.32 [1]
[1] On January 4, 2018, there was a 1-for-4 reverse share split. Historical shares outstanding, net asset value per share and market value per share have been adjusted to reflect the 1-for-4 reverse share split on a retroactive basis.