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Statements of Changes in Partners' Capital (Parenthetical) - shares | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Statements of Changes in Partners' Capital |  |  |
Addition of partnership units | 44,600,000 | 67,200,000 | 66,825,000
Redemption of partnership units | 28,500,000 | 84,957,031 | 53,350,000

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