The movement in the allowance for doubtful debts during the year, including both specific and collective loss components, is as follows:
| 2015 | 2016 | 2017 | ||||||||||
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Balance, beginning of year |
4,464 | 4,910 | 5,466 | |||||||||
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Allowance for the year |
3,365 | 3,999 | 3,325 | |||||||||
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Written-off during the year |
(2,919 | ) | (3,443 | ) | (3,581 | ) | ||||||
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Balance, end of year |
4,910 | 5,466 | 5,210 | |||||||||
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