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Statements of Cash Flows - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Cash Flows from Operating Activities: |  |  |
Net income (loss) | $ 15,451,090 | $ 37,005,128 | $ (43,645,160)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities: |  |  |
(Increase) decrease in commodity futures trading account - cash and cash equivalents | (5,869,595) | 12,434,314 | (11,579,384)
Unrealized (gain) loss on open futures contracts | (3,255,030) | (9,775,220) | 1,095,250
(Increase) decrease in receivable from General Partner | (141,688) | (54,380) | (41,001)
(Increase) decrease in dividends receivable | (6,613) | (10,339) | (13)
(Increase) decrease in interest receivable | (9,575) | 0 | 0
(Increase) decrease in ETF transaction fees receivable | 350 | 0 | 0
Increase (decrease) in General Partner management fees payable | (12,926) | 25,134 | 27,097
Increase (decrease) in professional fees payable | 135,701 | (5,790) | (2,625)
Increase (decrease) in brokerage commissions payable | (1,860) | 1,430 | 4,060
Increase (decrease) in directors' fees and insurance payable | (56) | 523 | 323
Net cash provided by (used in) operating activities | 6,289,798 | 39,620,800 | (54,141,453)
Cash Flows from Financing Activities: |  |  |
Addition of partnership shares | 40,082,469 | 41,041,049 | 124,538,212
Redemption of partnership shares | (71,195,236) | (45,491,088) | (38,808,966)
Net cash provided by (used in) financing activities | (31,112,767) | (4,450,039) | 85,729,246
Net Increase (Decrease) in Cash and Cash Equivalents | (24,822,969) | 35,170,761 | 31,587,793
Cash and Cash Equivalents, beginning of year | 103,167,056 | 67,996,295 | 36,408,502
Cash and Cash Equivalents, end of year | $ 78,344,087 | $ 103,167,056 | $ 67,996,295

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