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Condensed Statements of Financial Condition - USD ($)
Jun. 30, 2017
Dec. 31, 2016
Assets    
Cash and cash equivalents (Notes 2 and 5) $ 394,372,298 $ 522,819,857
Equity in trading accounts:    
Cash and cash equivalents 48,122,106 44,966,225
Unrealized gain (loss) on open commodity futures contracts 5,291,350 37,435,507
Receivable for shares sold 0 4,646,990
Dividends receivable 12,352 14,954
Directors' fees and insurance receivable 8,901 0
Prepaid registration fees 241,547 187,798
ETF transaction fees receivable 0 2,000
Total assets 448,048,554 610,073,331
Liabilities and Partners' Capital    
Payable due to Broker 0 44,770,339
Payable for shares redeemed 0 26,641,069
General Partner management fees payable (Note 3) 217,760 303,354
Professional fees payable 273,567 437,218
Brokerage commissions payable 72,800 85,200
Directors' fees and insurance payable 0 5,417
License fees payable 7,359 19,932
Total liabilities 571,486 72,262,529
Commitments and Contingencies (Notes 3, 4 and 5)
Partners' Capital    
General Partner 0 0
Limited Partners 447,477,068 537,810,802
Total Partners' Capital 447,477,068 537,810,802
Total liabilities and partners' capital $ 448,048,554 $ 610,073,331
Limited Partners' shares outstanding 65,966,476 57,866,476
Net asset value per share $ 6.78 $ 9.29
Market value per share $ 6.78 $ 9.34