Reporters raise their hands to ask Federal Reserve Chair Jerome Powell questions during a news conference in Washington, DC, on March 20. Chip Somodevilla/Getty ImagesWednesday marked Federal Reserve Chair Jerome Powell’s 49th press conference since he assumed the role six years ago. His lengthy tenure showed more than usual.Powell maintained a straight face throughout most of the briefing, which lasted the usual hour or so. But at times it seemed he was perhaps itching to head for the door. Here are five moments that stood out:A reporter asked Powell to provide an update on the central…