CANADA STOCKS-TSX slumps to 8-month low on U.S. data, oil prices

* TSX down 166.80 points, or 1.19 percent, at 13,869.88 * All 10 main index sectors decline, banks drop * Energy shares follow U.S. crude oil price lower (Adds details, quotes, byline, updates prices) By John Tilak and Leah Schnurr TORONTO, Oct 15 (Reuters) - Canada's main stock index dropped on Wednesday to its lowest level in eight months, as sluggish U.S. economic data fed concerns about the global economy and oil prices slid again. The benchmark TSX has fallen into offi