Antonyms:

increase

a change resulting in an increase

types:

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shrinkage, shrinking

the process or result of becoming less or smaller

casualty

a decrease of military personnel or equipment

sinking

a slow fall or decline (as for lack of strength)

attrition

a wearing down to weaken or destroy

dwindling, dwindling away

a becoming gradually less

waning

a gradual decrease in magnitude or extent

compression, condensation, contraction

the process or result of becoming smaller or pressed together

damage, equipment casualty

loss of military equipment

loss, personnel casualty

military personnel lost by death or capture

fading away

gradually diminishing in brightness or loudness or strength

type of:

alteration, change, modification

an event that occurs when something passes from one state or phase to another