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Consolidated Balance Sheets (Parentheticals) - shares | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
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Equity: |  |  |  |
Limited partners: Depositary units issued | 241,338,835 | 214,078,558 | 191,366,097 | 173,564,307
Limited partners: Depositary units outstanding | 241,338,835 | 214,078,558 |  |

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