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Condensed Statements of Cash Flows - USD ($) | 9 Months Ended
--- | ---
Sep. 30, 2019 | Sep. 30, 2018
Cash Flows from Operating Activities: |  |  |
Net income (loss) |  | $ 15,071,039 | $ 23,563,473
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities: |  |  |
Unrealized (gain) loss on open futures contracts |  | 341,900 | (278,490)
(Increase) decrease in receivable from General Partner |  | 36,890 | 253,375
(Increase) decrease in dividends receivable |  | (16,991) | (22,587)
(Increase) decrease in interest receivable |  | (904) | 2,660
(Increase) decrease in prepaid insurance | [1] | (2,767) | 1,017
(Increase) decrease in ETF transaction fees receivable |  | 0 | 350
Increase (decrease) in General Partner management fees payable |  | 963 | (5,854)
Increase (decrease) in professional fees payable |  | (107,763) | (56,795)
Increase (decrease) in brokerage commissions payable |  | 0 | (2,500)
Increase (decrease) in directors' fees payable | [1] | 314 | 476
Increase (decrease) in insurance payable | [1] | 0 | 3,184
Net cash provided by (used in) operating activities |  | 15,322,681 | 23,458,309
Cash Flows from Financing Activities: |  |  |
Addition of partnership shares |  | 17,034,820 | 23,719,011
Redemption of partnership shares |  | (28,827,507) | (38,351,509)
Net cash provided by (used in) financing activities |  | (11,792,687) | (14,632,498)
Net Increase (Decrease) in Cash and Cash Equivalents |  | 3,529,994 | 8,825,811
Total Cash, Cash Equivalents and Equity in Trading Accounts, beginning of period |  | 80,057,642 | 92,511,503
Total Cash, Cash Equivalents and Equity in Trading Accounts, end of period |  | $ 83,587,636 | $ 101,337,314
[1] | Certain prior year amounts have been reclassified for consistency with the current presentation.

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