private function getRow(ResultInterface $bound, $key, $type, $round)
{
$value = $bound->get($type, $key);
$value = !is_null($value) ? round($bound->get($type, $key), $round) : '?';
return sprintf('<%1$s>%2$s</%1$s>', $this->getStyle($type == 'average' ? $key : null, $value), $value);
}