If the ratio between an exemption granted under
§ 458, Subdivision 5(a), of the Real Property Tax Law, regarding
veterans exemptions, and the total assessed value of the real property
for which such exemption has been granted increases or decreases due
only to a full value assessment in the tax district in which such
real property is located, the amount of the exemption heretofore or
hereafter granted shall be increased or decreased in such subsequent
year in the same proportion as the total assessed value has been increased
or decreased.