Indonesia’s domestic cement sales fell a marginal 0.1 per cent to 2.243Mt in January, data from the country’s cement association showed on Thursday.  The decline follows slowing growth in the industry last year when the pace of sales fell to 4.9 per cent from 9.1 per cent in 2004, due to higher inflation and interest rates in Southeast Asia’s largest economy.  However, domestic sales of PT Semen Gresik Tbk , Indonesia’s largest cement maker, rose 5.7 per cent to 1.02Mt. Gresik accounted for around 46 per cent of January sales. The data, seen as an indicator of economic activity in the fourth most populous nation, showed total sales by Indonesian companies, including exports, rose 2.5 per cent in January.