pre_text: 9. Pensions continued Defined benefit plans continued ii) Amounts in the financial statements continued e) Movements in the fair value of plans’ assets
table: 2019 2018
table: $ million $ million
table: At 1 January 254.2 282.6
table: Interest income on plans’ assets 7.0 7.0
table: Employer contributions 6.6 6.8
table: Benefit payments (11.4) (12.1)
table: Plan administration expenses (0.6) (0.5)
table: Re-measurement gain/(loss) on plans’ assets 25.8 (14.2)
table: Exchange adjustment 9.5 (15.4)
table: Fair value of plans’ assets 291.1 254.2
question: Analyse this data from a financial earnings document. What was the change in the fair value of plans' assets?