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Condensed Statements of Cash Flows - USD ($) | 9 Months Ended
--- | ---
Sep. 30, 2017 | Sep. 30, 2016
Cash Flows from Operating Activities: |  |
Net income (loss) | $ (152,131,287) | $ 16,489,055
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 | (43,915,357) | (33,277,614)
Unrealized (gain) loss on open futures contracts | 56,069,637 | 119,737,962
(Increase) decrease in dividends receivable | 559 | (10,957)
(Increase) decrease in interest receivable | (25,774) | 0
(Increase) decrease in directors' fees and insurance receivable | (1,445) | 24,839
(Increase) decrease in prepaid registration fees | (12,112) | 303,041
(Increase) decrease in ETF transaction fees receivable | 0 | 1,000
Increase (decrease) in payable due to Broker | (44,770,339) | (40,863,950)
Increase (decrease) in General Partner management fees payable | (62,879) | 29,212
Increase (decrease) in professional fees payable | (17,873) | (791,729)
Increase (decrease) in brokerage commissions payable | (12,400) | 1,450
Increase (decrease) in directors' fees and insurance payable | (5,417) | 0
Increase (decrease) in license fees payable | (11,594) | (3,513)
Net cash provided by (used in) operating activities | (184,896,281) | 61,638,796
Cash Flows from Financing Activities: |  |
Addition of partnership shares | 1,211,520,273 | 357,303,689
Redemption of partnership shares | (1,107,715,873) | (348,826,140)
Net cash provided by (used in) financing activities | 103,804,400 | 8,477,549
Net Increase (Decrease) in Cash and Cash Equivalents | (81,091,881) | 70,116,345
Cash and Cash Equivalents, beginning of period | 522,819,857 | 453,830,484
Cash and Cash Equivalents, end of period | $ 441,727,976 | $ 523,946,829

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