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Condensed Statements of Operations - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Gain (loss) on trading of commodity futures contracts: |  |  |  |
Realized gain (loss) on closed futures contracts | $ 719,826,560 | $ 440,514,984 | $ 504,268,950 | $ 116,003,534
Change in unrealized gain (loss) on open futures contracts | (74,855,450) | 68,810,885 | (33,328,530) | 120,444,675
Dividend income | 572,471 | 17,639 | 920,883 | 33,856
Interest income | 2,323,518 | 321,493 | 4,068,781 | 516,091
ETF transaction fees | 69,000 | 88,000 | 154,000 | 183,000
Total income (loss) | 647,936,099 | 509,753,001 | 476,084,084 | 237,181,156
Expenses |  |  |  |
General Partner management fees (Note 3) | 3,924,293 | 2,903,429 | 7,843,623 | 5,461,346
Professional fees | 673,118 | 243,499 | 1,346,433 | 458,076
Brokerage commissions | 1,603,540 | 1,094,815 | 3,832,708 | 2,282,032
Directors' fees and insurance | 94,090 | 74,156 | 181,641 | 142,240
License fees | 130,810 | 96,781 | 261,454 | 182,045
Registration fees | 83,367 | 80,969 | 164,336 | 86,308
Total expenses | 6,509,218 | 4,493,649 | 13,630,195 | 8,612,047
Net income (loss) | $ 641,426,881 | $ 505,259,352 | $ 462,453,889 | $ 228,569,109
Net income (loss) per limited partnership share (in dollars per share) | $ 1.82 | $ 3.06 | $ 0.54 | $ (0.22)
Net income (loss) per weighted average limited partnership share (in dollars per share) | $ 2.03 | $ 3.84 | $ 1.34 | $ 1.76
Weighted average limited partnership shares outstanding (in shares) | 316,056,044 | 131,492,308 | 345,501,648 | 129,858,564

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