* TSX down 97.52 points, or 0.77 percent, at 12,616.53 * Nine of 10 main sectors decline * Bombardier shares lose 6 percent after results By John Tilak TORONTO, Feb 21 (Reuters) - Canada's main stock index stumbled to a five-week low on Thursday, led by energy and financial stocks, as a bigger-than-expected rise in U.S. weekly jobless claims and surprisingly weak euro zone economic data weighed on the market. Bombardier Inc was also a major drag on the market. Its shares fel