27(4)If an annual payment is paid before the first day of April, 1998 for the issuance or renewal of an approval to be valid before, on and after the thirty-first day of March, 1998, the annual payment payable under subsection (1) on the first day of April, 1998 shall be reduced by the portion of the previous payment that related to the portion of a year after the thirty-first day of March, 1998, for which the previous payment was made, prorated based on the number of days in that portion of a year.