public function centuryName(int $century): string
    {
        if ($century < 0) {
            return I18N::translate('%s BCE', $this->centuryName(-$century));
        }

        // The current chart engine (Google charts) can't handle <sup></sup> markup
        switch ($century) {
            case 21:
                return strip_tags(I18N::translateContext('CENTURY', '21st'));
            case 20:
                return strip_tags(I18N::translateContext('CENTURY', '20th'));
            case 19:
                return strip_tags(I18N::translateContext('CENTURY', '19th'));
            case 18:
                return strip_tags(I18N::translateContext('CENTURY', '18th'));
            case 17:
                return strip_tags(I18N::translateContext('CENTURY', '17th'));
            case 16:
                return strip_tags(I18N::translateContext('CENTURY', '16th'));
            case 15:
                return strip_tags(I18N::translateContext('CENTURY', '15th'));
            case 14:
                return strip_tags(I18N::translateContext('CENTURY', '14th'));
            case 13:
                return strip_tags(I18N::translateContext('CENTURY', '13th'));
            case 12:
                return strip_tags(I18N::translateContext('CENTURY', '12th'));
            case 11:
                return strip_tags(I18N::translateContext('CENTURY', '11th'));
            case 10:
                return strip_tags(I18N::translateContext('CENTURY', '10th'));
            case 9:
                return strip_tags(I18N::translateContext('CENTURY', '9th'));
            case 8:
                return strip_tags(I18N::translateContext('CENTURY', '8th'));
            case 7:
                return strip_tags(I18N::translateContext('CENTURY', '7th'));
            case 6:
                return strip_tags(I18N::translateContext('CENTURY', '6th'));
            case 5:
                return strip_tags(I18N::translateContext('CENTURY', '5th'));
            case 4:
                return strip_tags(I18N::translateContext('CENTURY', '4th'));
            case 3:
                return strip_tags(I18N::translateContext('CENTURY', '3rd'));
            case 2:
                return strip_tags(I18N::translateContext('CENTURY', '2nd'));
            case 1:
                return strip_tags(I18N::translateContext('CENTURY', '1st'));
            default:
                return ($century - 1) . '01-' . $century . '00';
        }
    }