pocketmine\Server::getTickUsage PHP Method

    public function getTickUsage()
    {
        return round($this->maxUse * 100, 2);
    }

 /**
  * Basic system wide variable definitions
  * @param Server $server - pocketmine Server
  * @param array &$vars - variables
  */
 public static function stdSysVars(Server $server, array &$vars)
 {
     foreach (["{tps}" => $server->getTicksPerSecond(), "{tickUsage}" => $server->getTickUsage()] as $a => $b) {
         $vars[$a] = $b;
     }
 }