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Statements of Financial Condition - USD ($)
Dec. 31, 2018
Dec. 31, 2017
Assets    
Cash and cash equivalents (at cost $1,223,159,803 and $1,846,630,713, respectively) (Notes 2 and 5) $ 1,223,159,803 $ 1,846,630,713
Equity in trading accounts:    
Cash and cash equivalents (at cost $433,776,173 and $144,626,242, respectively) 433,776,173 144,626,242
Unrealized gain (loss) on open commodity futures contracts (194,392,958) 117,780,350
Receivable for shares sold 22,022,450 38,651,232
Dividends receivable 144,034 154,339
Interest receivable 29,030 32,182
Prepaid registration fees 579,117 928,407
ETF transaction fees receivable 2,000 2,000
Total assets 1,485,319,649 2,148,805,465
Liabilities and Partners' Capital    
Payable due to Broker 0 57,283,329
Payable for shares redeemed 14,377,830 68,847,507
General Partner management fees payable (Note 3) 583,978 799,622
Professional fees payable 1,741,281 2,058,723
Brokerage commissions payable 89,961 187,961
Directors' fees and insurance payable 11,249 21,788
License fees payable 53,638 75,125
Total liabilities 16,857,937 129,274,055
Commitments and Contingencies (Notes 3, 4 and 5)
Partners' Capital    
General Partner 0 0
Limited Partners 1,468,461,712 2,019,531,410
Total Partners' Capital 1,468,461,712 2,019,531,410
Total liabilities and partners' capital $ 1,485,319,649 $ 2,148,805,465
Limited Partners' shares outstanding 153,200,000 167,200,000
Net asset value per share $ 9.59 $ 12.08
Market value per share $ 9.66 $ 12.01