17. Inventories

(in millions of euros)

December 31, 2016

December 31, 2015

Maintenance materials

120

110

Projects under construction, unsold

5

17

Trade goods

14

11

Total

139

138

Inventories of maintenance materials consist of raw materials and materials for the purpose of production and maintenance of semi-finished and finished products of the maintenance department. In 2016, the write-down of inventories to the net realisable value and recognised as an expense amounted to €11 million (€6 million in 2015). The cumulative impairment, after withdrawals, came to €94 million at the end of 2015 (€95 million in 2015).