Studios and exhibitors will need a strong finish to 2017 to rebound from some underperforming summer releasesWith just two weekends left in Hollywood’s official summer movie season, the total domestic box office from the start of May to date sits at an estimated $3.43 billion, according to data from comScore and Box Office Mojo.[...] overall box office since the start of 2017 totals is down 3.5 percent, currently sitting at $7.18 billion.[...] North America’s four top cinema chains — including Cineplex, Regal Cinemas, and Cinemark — reported a combined market value loss of $1.3 billion since August 1.“There was just a lack of big-ticket items to keep audiences coming in on a regular basis,” Exhibitor Relations analyst Jeff Bock told TheWrap.The fourth top grosser, “Despicable Me 3,” has been the big family audience draw of the summer with $247 million and counting. Another animated movie, Universal’s “The Secret Life of Pets,” grossed $368 million, while Warner Bros.While many of these films were not flops for their studios given overseas performance, neither did they provide the shot in the arm in between comic book movie releases that analysts and exhibitors were hoping for.[...] while Paramount’s “Baywatch” performed OK overseas, the $69 million comedy only made $58 million in the U.S. This result, combined with that of “Pirates 5,” contributed to the lowest Memorial Day Weekend numbers since 1999.Joining them is Universal’s $160 million reboot of “The Mummy,” which made just $80 million domestically but earned a respectable $322 million from overseas markets.“It’s going to take several hit movies in a row to get consumers back on track,” he said.