def raw_national
      return nil if sanitized.nil? || sanitized.empty?
      if valid?
        @national_number
      elsif country_code && sanitized.start_with?(country_code)
        sanitized[country_code.size..-1]
      else
        sanitized
      end
    end
def raw_national
      return nil if sanitized.nil? || sanitized.empty?
      if valid?
        @national_number
      elsif country_code && sanitized.start_with?(country_code)
        sanitized[country_code.size..-1]
      else
        sanitized
      end
    end
Returns the raw national number that was defined during parsing
 @return [String] raw national number