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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) | $ (77,617,254) | $ 110,037,462 | $ (193,443,975)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities: |  |  |
Unrealized (gain) loss on open futures contracts | (46,252,567) | 122,742,937 | (18,286,173)
(Increase) decrease in dividends receivable | (62,127) | (61,099) | (2,090)
(Increase) decrease in interest receivable | 4,443 | 1,903 | (11,573)
(Increase) decrease in prepaid insurance | 635 | (3,646) | (79)
(Increase) decrease in prepaid registration fees | (392,476) | 83,258 | 29,526
(Increase) decrease in ETF transaction fees receivable |  | 1,000 |
Increase (decrease) in payable due to Broker |  |  | (44,770,339)
Increase (decrease) in General Partner management fees payable | 26,513 | (131,834) | 9,112
Increase (decrease) in professional fees payable | (77,219) | (28,822) | 455,541
Increase (decrease) in brokerage commissions payable |  | (36,500) | (12,400)
Increase (decrease) in directors' fees payable | 2,089 | (4,301) | 3,007
Increase (decrease) in license fees payable | (2,045) | (8,116) | (7,138)
Net cash provided by (used in) operating activities | (124,370,008) | 232,592,242 | (256,036,581)
Cash Flows from Financing Activities: |  |  |
Addition of partnership shares | 914,876,988 | 1,744,841,011 | 1,786,316,120
Redemption of partnership shares | (691,299,703) | (2,269,580,373) | (1,446,127,327)
Net cash provided by (used in) financing activities | 223,577,285 | (524,739,362) | 340,188,793
Net Increase (Decrease) in Cash and Cash Equivalents | 99,207,277 | (292,147,120) | 84,152,212
Total Cash, Cash Equivalents and Equity in Trading Accounts, beginning of year | 359,791,174 | 651,938,294 | 567,786,082
Total Cash, Cash Equivalents and Equity in Trading Accounts, end of year | $ 458,998,451 | $ 359,791,174 | $ 651,938,294

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