Indonesian cement maker PT Semen Gresik said cement sales for the first 11 months of 2003 fell 5.4 per cent to 12.83Mt due to a drop in domestic sales and exports.  Semen Gresik's domestic cement sales during the January to November period were down 1.9 per cent at 10.90Mt and exports slumped 21 per cent to 1.93Mt. According to data from Indonesia's cement producer association, national cement sales for the first 11 months last year dropped 3.1 per cent to 31.94Mt from 32.98Mt a year earlier.