-71.52% is the change from 309 to 88
Calculation steps:
[( 88 - 309 ) ÷ 309] x 100 = -71.52%
Formula
Percentage change = [(88 - 309) / 309] x 100
Subtract the new number by the original number
88 - 309 = -221
-221 ÷ 309 = -0.7152103559870551
-0.7152103559870551 x 100 = -71.52%