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Statements of Cash Flows - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Cash Flows from Operating Activities: |  |  |
Net income (loss) | $ 473,455,704 | $ (291,274,645) | $ 78,972,397
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities: |  |  |
Unrealized (gain) loss on open futures contracts | (231,913,525) | 312,173,308 | (6,489,790)
(Increase) decrease in dividends receivable | 138,151 | 10,305 | 68,612
(Increase) decrease in interest receivable | 831 | 3,152 | (32,182)
(Increase) decrease in prepaid insurance | (7,571) | (5,114) | 1,590
(Increase) decrease in prepaid registration fees | 504,876 | 349,290 | 348,425
(Increase) decrease in ETF transaction fees receivable | 0 | 0 | 3,000
Increase (decrease) in payable due to Broker | 8,820,649 | (57,283,329) | (53,495,599)
Increase (decrease) in General Partner management fees payable | (116,084) | (215,644) | (456,590)
Increase (decrease) in professional fees payable | (287,285) | (317,442) | 229,229
Increase (decrease) in brokerage commissions payable | 0 | (98,000) | (48,000)
Increase (decrease) in directors' fees payable | 441 | (5,425) | (5,918)
Increase (decrease) in license fees payable | (13,869) | (21,487) | (75,801)
Net cash provided by (used in) operating activities | 250,582,318 | (36,685,031) | 19,019,373
Cash Flows from Financing Activities: |  |  |
Addition of partnership shares | 3,218,764,872 | 3,988,747,637 | 4,138,684,744
Redemption of partnership shares | (3,950,037,755) | (4,286,383,585) | (5,336,829,913)
Net cash provided by (used in) financing activities | (731,272,883) | (297,635,948) | (1,198,145,169)
Net Increase (Decrease) in Cash and Cash Equivalents | (480,690,565) | (334,320,979) | (1,179,125,796)
Total Cash, Cash Equivalents and Equity in Trading Accounts, beginning of year | 1,656,935,976 | 1,991,256,955 | 3,170,382,751
Total Cash, Cash Equivalents and Equity in Trading Accounts, end of year | $ 1,176,245,411 | $ 1,656,935,976 | $ 1,991,256,955

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