public static function relativePercent($normal, $current): string
    {
        $normal = (float)$normal;
        $current = (float)$current;

        if (!$normal || $normal === $current) {
            return '100';
        }

        $normal = abs($normal);
        $percent = round($current / $normal * 100);

        return number_format($percent, 0, '.', ' ');
    }