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Condensed Statements of Financial Condition - USD ($)
Sep. 30, 2018
Dec. 31, 2017
Assets    
Cash and cash equivalents (at cost $1,488,417,608 and $1,846,630,713, respectively) (Notes 2 and 5) $ 1,488,417,608 $ 1,846,630,713
Equity in trading accounts:    
Cash and cash equivalents (at cost $135,097,595 and $144,626,242, respectively) 135,097,595 144,626,242
Unrealized gain (loss) on open commodity futures contracts 126,109,700 117,780,350
Receivable for shares sold 7,615,065 38,651,232
Dividends receivable 187,264 154,339
Interest receivable 38,508 32,182
Prepaid registration fees 835,080 928,407
ETF transaction fees receivable 1,000 2,000
Total assets 1,758,301,820 2,148,805,465
Liabilities and Partners' Capital    
Payable due to Broker 0 57,283,329
Payable for shares redeemed 0 68,847,507
General Partner management fees payable (Note 3) 490,265 799,622
Professional fees payable 1,595,608 2,058,723
Brokerage commissions payable 137,961 187,961
Directors' fees and insurance payable 111,006 21,788
License fees payable 57,839 75,125
Total liabilities 2,392,679 129,274,055
Commitments and Contingencies (Notes 3, 4 and 5)
Partners' Capital    
General Partner 0 0
Limited Partners 1,755,909,141 2,019,531,410
Total Partners' Capital 1,755,909,141 2,019,531,410
Total liabilities and partners' capital $ 1,758,301,820 $ 2,148,805,465
Limited Partners' shares outstanding 113,500,000 167,200,000
Net asset value per share $ 15.47 $ 12.08
Market value per share $ 15.52 $ 12.01