Indonesia's largest cement maker, PT Semen Indonesia Tbk, said its sales in May were down 13.9 per cent from the last year at 1.98Mt, Indonesia Finance Today reported, quoting the firm's investor relations officer Anto Brilianto.

The cement producer sold 9.91Mt of cement in the first five months of 2015, down 5.3 per cent from 10.47Mt during the same period last year.