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Finance Expense, Net (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 MXN ($) $ / $ | Dec. 31, 2019 MXN ($) $ / $ | Dec. 31, 2018 MXN ($) $ / $
Finance Expense, Net |  |  |
Interest expense | $ (10,482,168) | $ (10,402,021) | $ (9,707,324)
Other finance expense, net |  | (873,177) | (859,642)
Finance expense | (10,482,168) | (11,275,198) | (10,566,966)
Interest income | 1,132,935 | 1,529,112 | 1,567,100
Foreign exchange gain, net | 3,004,934 | 935,291 | 220,149
Other finance income, net | 89,323 |  |
Finance income | 4,227,192 | 2,464,403 | 1,787,249
Finance expense, net | (6,254,976) | (8,810,795) | $ (8,779,717)
Additional lease liabilities | $ 426,672 | $ 426,541 |
Foreign exchange rate | $ / $ | 19.9493 | 18.8838 | 19.6730

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