Canada’s main stock index dipped marginally on Thursday, endangering a nine-day winning streak after a drop in oil prices hurt the energy sector. * At 9:35 a.m. ET (1435 GMT), the Toronto Stock Exchange’s S&P/TSX composite index was down 28.16 points, or 0.19 percent, at 15,083.1. * The energy sector dropped 0.6 percent, the most among the 11 main sectors. …