Deferred income

x 1 million

2020

2019

Book value at 1 January

725

648

Customer construction contributions received

105

96

Income recognised

-21

-19

Book value at 31 December

809

725

Classification

2020

2019

Current

22

18

Non-current

787

707

Total

809

725

The short-term deferred income is reported under 'contract liabilities' in 'Trade and other liabilities'.