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Condensed Statements of Cash Flows - USD ($) | 6 Months Ended
--- | ---
Jun. 30, 2015 | Jun. 30, 2014
Cash Flows from Operating Activities: |  |
Net income (loss) | $ 228,569,109 | $ 61,641,050
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 | 3,747,258 | (10,784,868)
Unrealized (gain) loss on futures contracts | (120,444,675) | (3,386,840)
(Increase) decrease in dividends receivable | (850) | 2,895
(Increase) decrease in interest receivable | 0 | 52
(Increase) decrease in directors' fees and insurance receivable | (12,101) | (27,016)
(Increase) decrease in prepaid registration fees | (889,772) | 0
(Increase) decrease in ETF transaction fees receivable | (2,000) | 4,000
Increase (decrease) in General Partner management fees payable | 472,838 | (48,374)
Increase (decrease) in professional fees payable | (531,285) | (486,297)
Increase (decrease) in brokerage commissions payable | 100,300 | (4,000)
Increase (decrease) in directors' fees and insurance payable | (21,780) | (20,881)
Increase (decrease) in license fees payable | 63,561 | (8,509)
Increase (decrease) in registration fees payable | 0 | (153)
Net cash provided by (used in) operating activities | 111,050,603 | 46,881,059
Cash Flows from Financing Activities: |  |
Addition of partnership shares | 4,381,467,351 | 2,462,085,762
Redemption of partnership shares | (3,544,898,325) | (2,475,475,959)
Net cash provided by (used in) financing activities | 836,569,026 | (13,390,197)
Net Increase (Decrease) in Cash and Cash Equivalents | 947,619,629 | 33,490,862
Cash and Cash Equivalents, beginning of period | 1,139,071,536 | 570,875,786
Cash and Cash Equivalents, end of period | $ 2,086,691,165 | $ 604,366,648

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