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Condensed Statements of Cash Flows - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Cash Flows from Operating Activities: |  |  |  |
Net income (loss) |  | $ (1,905,181,579) | $ 473,455,704 | $ (291,274,645)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities: |  |  |  |
Change in unrealized (gain) loss on open commodity futures contracts |  | (363,923,391) | (231,913,525) | 312,173,308
(Increase) decrease in dividends receivable |  | 2,200 | 138,151 | 10,305
(Increase) decrease in interest receivable |  | (132,758) | 831 | 3,152
(Increase) decrease in prepaid insurance | [1] | 817 | (7,571) | (5,114)
(Increase) decrease in prepaid registration fees |  | (1,185,800) | 504,876 | 349,290
Increase (decrease) in payable due to Broker |  | 14,846,706 | 8,820,649 | (57,283,329)
Increase (decrease) in General Partner management fees payable |  | 939,671 | (116,084) | (215,644)
Increase (decrease) in professional fees payable |  | 449,177 | (287,285) | (317,442)
Increase (decrease) in brokerage commissions payable |  | 233,897 |  | (98,000)
Increase (decrease) in directors' fees payable | [1] | 8,661 | 441 | (5,425)
Increase (decrease) in license fees payable |  | 129,894 | (13,869) | (21,487)
Net cash provided by (used in) operating activities |  | (2,253,812,505) | 250,582,318 | (36,685,031)
Cash Flows from Financing Activities: |  |  |  |
Addition of partnership shares |  | 8,030,979,653 | 3,218,764,872 | 3,988,747,637
Redemption of partnership shares |  | (3,644,174,420) | (3,950,037,755) | (4,286,383,585)
Net cash provided by (used in) financing activities |  | 4,386,805,233 | (731,272,883) | (297,635,948)
Net Increase (Decrease) in Cash and Cash Equivalents |  | 2,132,992,728 | (480,690,565) | (334,320,979)
Total Cash, Cash Equivalents and Equity in Trading Accounts, beginning of year |  | 1,176,245,411 | 1,656,935,976 | 1,991,256,955
Total Cash, Cash Equivalents and Equity in Trading Accounts, end of year |  | $ 3,309,238,139 | $ 1,176,245,411 | $ 1,656,935,976
[1] | Certain prior year amounts have been reclassified for consistency with the current presentation.

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