7.2 Changes in the allowance for doubtful accounts
| 2017 | 2016 | 2015 | ||||||||||
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Opening balance |
Ps. | 1,193 | Ps. | 849 | Ps. | 456 | ||||||
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Allowance for the year |
530 | 467 | 167 | |||||||||
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Charges and write-offs of uncollectible accounts |
(400 | ) | (418 | ) | (99 | ) | ||||||
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Addition from business combinations |
86 | 94 | 401 | |||||||||
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Effects of changes in foreign exchange rates |
(32 | ) | 201 | (76 | ) | |||||||
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Venezuela deconsolidation effect |
(2 | ) | — | — | ||||||||
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Ending balance |
Ps. | 1,375 | Ps. | 1,193 | Ps. | 849 | ||||||
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