Changes in the balance of trust assets
| 2017 | 2016 | 2015 | ||||||||||
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Pension and retirement plans: |
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Balance at beginning of year |
Ps.910 | Ps.864 | Ps.872 | |||||||||
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Actual return on trust assets |
113 | 15 | 26 | |||||||||
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Foreign exchange gain |
86 | 4 | 2 | |||||||||
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Life annuities |
21 | 28 | 27 | |||||||||
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Benefits paid |
(136 | ) | (1 | ) | (63 | ) | ||||||
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Acquisitions |
698 | — | — | |||||||||
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Balance at end of year |
Ps.1,692 | Ps.910 | Ps. 864 | |||||||||
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Seniority premiums |
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Balance at beginning of year |
Ps.102 | Ps.101 | Ps.92 | |||||||||
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Actual return on trust assets |
7 | 1 | 9 | |||||||||
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Balance at end of year |
Ps.109 | Ps.102 | Ps.101 | |||||||||
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