def get_stating_point(sheet):
    """
    Finds the point in the sheet where the data actually begins
    :param sheet: the sheet as a list of lists
    :return: the index where the data actually begins
    """
    data = sheet
    start_point = 0
    for row_id, row_data in enumerate(sheet):
        if len(row_data) > 0 and data[row_id][0] == 'Commodity':
            return start_point + 1
        start_point += 1
    return -1