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Condensed Statements of Cash Flows - USD ($) | 6 Months Ended
--- | ---
Jun. 30, 2016 | Jun. 30, 2015
Cash Flows from Operating Activities: |  |
Net income (loss) | $ 462,453,889 | $ 228,569,109
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 | (72,869,830) | 3,747,258
Unrealized (gain) loss on open futures contracts | 33,328,530 | (120,444,675)
(Increase) decrease in dividends receivable | (177,997) | (850)
(Increase) decrease in directors' fees and insurance receivable | (54,750) | (12,101)
(Increase) decrease in prepaid registration fees | (726,421) | (889,772)
(Increase) decrease in ETF transaction fees receivable | (2,000) | (2,000)
Increase (decrease) in General Partner management fees payable | 66,303 | 472,838
Increase (decrease) in professional fees payable | (629,701) | (531,285)
Increase (decrease) in brokerage commissions payable | (25,000) | 100,300
Increase (decrease) in directors' fees and insurance payable | (42,863) | (21,780)
Increase (decrease) in license fees payable | 45,779 | 63,561
Net cash provided by (used in) operating activities | 421,365,939 | 111,050,603
Cash Flows from Financing Activities: |  |
Addition of partnership shares | 1,907,604,740 | 4,381,467,351
Redemption of partnership shares | (2,126,168,594) | (3,544,898,325)
Net cash provided by (used in) financing activities | (218,563,854) | 836,569,026
Net Increase (Decrease) in Cash and Cash Equivalents | 202,802,085 | 947,619,629
Cash and Cash Equivalents, beginning of period | 2,725,177,054 | 1,139,071,536
Cash and Cash Equivalents, end of period | $ 2,927,979,139 | $ 2,086,691,165

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