CHARLESTON, W.Va. (AP) — West Virginia had the third-fastest economic growth in the nation last year with the mining industry leading the charge. A boom in natural gas drilling, not the struggling coal industry, led the expansion. The U.S. Department of Commerce said West Virginia's real gross domestic product grew 5.1 percent to $68 billion in 2014, up from $64.7 billion in 2013. West Virginia's growth was tied with Wyoming.