ByJohn S. McClenahen After plummeting 0.4% in September, the Conference Board's index of leading economic indicators for Mexico rebounded in October, rising 0.4%. However, "most of this fluctuation reflected volatility in oil prices," the New York-based business research group noted when it released the data in mid-December. The leading index now stands at 106.1 (1990=100). For the six months ending in October, the leading index increased 0.3%. "The flat to slightly rising trend of the leading index is consistent with a sluggish, but still positive, average rate of economic growth in the near term," the Conference Board said.