def get_engagement_rate_min(selectpicker_id: str) -> int:
    """
    Min-Delegate-target of get_engagement_rates_min_max (dac-pattern)

    :param selectpicker_id:
    :return: int -> min-value of engagement-rate
    """
    min_values = {
        "1": 0,
        "2": 1,
        "3": 2,
        "4": 3,
        "5": 4,
        "6": 5,
        "7": 6,
        "8": 7,
        "9": 8,
        "10": 9,
        "11": 10,
        "12": 15,
        "13": 20,
        "14": 30,
        "15": 40,
        "16": 50
    }
    return min_values.get(selectpicker_id, 0)