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Condensed Statements of Cash Flows - USD ($) | 6 Months Ended
--- | ---
Jun. 30, 2018 | Jun. 30, 2017
Cash Flows from Operating Activities: |  |
Net income (loss) | $ 424,125,680 | $ (511,928,455)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities: |  |
Unrealized (gain) loss on open futures contracts | (85,850,330) | 117,545,460
(Increase) decrease in dividends receivable | (85,373) | (101,732)
(Increase) decrease in interest receivable | (20,344) | 0
(Increase) decrease in directors' fees and insurance receivable | (51,967) | (46,375)
(Increase) decrease in prepaid registration fees | 87,363 | 172,781
(Increase) decrease in ETF transaction fees receivable | (1,000) | 2,000
Increase (decrease) in payable due to Broker | 119,207,725 | (110,778,928)
Increase (decrease) in General Partner management fees payable | (125,088) | (277,027)
Increase (decrease) in professional fees payable | (761,854) | (805,874)
Increase (decrease) in brokerage commissions payable | (50,000) | (48,000)
Increase (decrease) in directors' fees and insurance payable | (21,788) | (26,116)
Increase (decrease) in license fees payable | (12,185) | (51,967)
Net cash provided by (used in) operating activities | 456,440,839 | (506,344,233)
Cash Flows from Financing Activities: |  |
Addition of partnership shares | 1,820,121,109 | 2,739,803,719
Redemption of partnership shares | (2,430,016,001) | (2,122,146,969)
Net cash provided by (used in) financing activities | (609,894,892) | 617,656,750
Net Increase (Decrease) in Cash and Cash Equivalents | (153,454,053) | 111,312,517
Total Cash, Cash Equivalents and Equity in Trading Accounts, beginning of period | 1,991,256,955 | 3,170,382,751
Total Cash, Cash Equivalents and Equity in Trading Accounts, end of period | 1,837,802,902 | 3,281,695,268
Components of Cash and Cash Equivalents: |  |
Cash and Cash Equivalents | 1,713,363,666 | 2,828,070,191
Equity in Trading Accounts: |  |
Cash and Cash Equivalents | 124,439,236 | 453,625,077
Total Cash, Cash Equivalents and Equity in Trading Accounts | $ 1,837,802,902 | $ 3,281,695,268

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