On Thursday, the benchmark indices were trading lower with Sensex down around 208 points or 0.32% at 66,890 and the Nifty-50 down around 53 points or 0.27% at 19,780. About 1,669 shares have advanced, 1,205 declined, and 142 are unchanged on the BSE. Top gainers and losers on BSE Sensex Index are as follows: The …