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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) |  | $ (202,815,769) | $ (77,617,254) | $ 110,037,462
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 |  | (6,313,791) | (46,252,567) | 122,742,937
(Increase) decrease in dividends receivable |  | 140,084 | (62,127) | (61,099)
(Increase) decrease in interest receivable |  | (8,959) | 4,443 | 1,903
(Increase) decrease in prepaid insurance | [1] | (6,015) | 635 | (3,646)
(Increase) decrease in prepaid registration fees |  | 364,200 | (392,476) | 83,258
(Increase) decrease in ETF transaction fees receivable |  | 0 | 0 | 1,000
Increase (decrease) in General Partner management fees payable |  | 4,957 | 26,513 | (131,834)
Increase (decrease) in professional fees payable |  | (122,717) | (77,219) | (28,822)
Increase (decrease) in brokerage commissions payable |  | 107,693 | 0 | (36,500)
Increase (decrease) in directors' fees payable | [1] | (5,124) | 2,089 | (4,301)
Increase (decrease) in license fees payable |  | 8,180 | (2,045) | (8,116)
Net cash provided by (used in) operating activities |  | (208,647,261) | (124,370,008) | 232,592,242
Cash Flows from Financing Activities: |  |  |  |
Addition of partnership shares |  | 1,003,414,098 | 914,876,988 | 1,744,841,011
Redemption of partnership shares |  | (813,282,721) | (691,299,703) | (2,269,580,373)
Net cash provided by (used in) financing activities |  | 190,131,377 | 223,577,285 | (524,739,362)
Net Increase (Decrease) in Cash and Cash Equivalents |  | (18,515,884) | 99,207,277 | (292,147,120)
Total Cash, Cash Equivalents and Equity in Trading Accounts, beginning of year |  | 458,998,451 | 359,791,174 | 651,938,294
Total Cash, Cash Equivalents and Equity in Trading Accounts, end of year |  | $ 440,482,567 | $ 458,998,451 | $ 359,791,174
[1] | Certain prior year amounts have been reclassified for consistency with the current presentation.

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