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Statements of Cash Flows - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Cash Flows from Operating Activities: |  |  |
Net income (loss) | $ (15,190,394) | $ 15,451,090 | $ 37,005,128
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities: |  |  |
Unrealized (gain) loss on open futures contracts | 11,877,420 | (3,255,030) | (9,775,220)
(Increase) decrease in receivable from General Partner | 249,791 | (141,688) | (54,380)
(Increase) decrease in dividends receivable | (821) | (6,613) | (10,339)
(Increase) decrease in interest receivable | 8,188 | (9,575) | 0
(Increase) decrease in ETF transaction fees receivable | 350 | 350 | 0
Increase (decrease) in General Partner management fees payable | (11,475) | (12,926) | 25,134
Increase (decrease) in professional fees payable | (52,980) | 135,701 | (5,790)
Increase (decrease) in brokerage commissions payable | (2,500) | (1,860) | 1,430
Increase (decrease) in directors' fees and insurance payable | 251 | (56) | 523
Net cash provided by (used in) operating activities | (3,122,170) | 12,159,393 | 27,186,486
Cash Flows from Financing Activities: |  |  |
Addition of partnership shares | 41,996,934 | 40,082,469 | 41,041,049
Redemption of partnership shares | (51,328,625) | (71,195,236) | (45,491,088)
Net cash provided by (used in) financing activities | (9,331,691) | (31,112,767) | (4,450,039)
Net Increase (Decrease) in Cash and Cash Equivalents | (12,453,861) | (18,953,374) | 22,736,447
Total Cash, Cash Equivalents and Equity in Trading Accounts, beginning of year | 92,511,503 | 111,464,877 | 88,728,430
Total Cash, Cash Equivalents and Equity in Trading Accounts, end of year | $ 80,057,642 | $ 92,511,503 | $ 111,464,877

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