public static function toISO1366Alpha2($countryCode)
    {
        if (!static::$data) {
            $file = fopen(__DIR__.'../../../data/countries.csv', 'r');
            while (!feof($file)) {
                $line = fgetcsv($file);
                static::$data[reset($line)] = end($line);
            }
        }

        return isset(static::$data[$countryCode]) ?
            static::$data[$countryCode] : false;
    }