def table_delta(first_summary, second_summary):
    """
    A listing of changes between two TableSummarySet objects.

    :param first_summary: First TableSummarySet object
    :param second_summary: Second TableSummarySet object
    :return: Change in number of rows
    """
    differences = []
    for first, second in zip(first_summary, second_summary):
        diff = first.number_of_rows - second.number_of_rows
        differences.append(diff)
    return differences