def parse_relative_year_value(relative_year: str) -> int:
    """
    Parses a relative year value such as "去年"
    :param relative_year: The year to parse
    :return: An integer representing the relative value of the year, for example -1
    """
    if relative_year == "去年":
        return -1
    if relative_year == "今年" or relative_year == "本年":
        return 0
    if relative_year == "来年":
        return 1
    if relative_year == "再来年":
        return 2
    raise ValueError(f"Could not parse the input as a relative year: {relative_year}")