Suits for maintenance and annuities.

In the suits hereinafter mentioned, fee shall be computed as follows:- (a) in a suit for maintenance on the amount claimed to be payable for one year; (b) in a suit for enhancement or reduction of maintenance, on the amount by which the annual maintenance is sought to be enhanced or reduced; (c) in a suit for annuities or other sums payable periodically, on five times the amount claimed to be payable for one year: Provided that, where the annuity is payable for less than five years, the fee shall be computed on the aggregate of the sums payable.