-87.5% is the change from 632 to 79
Calculation steps:
[( 79 - 632 ) ÷ 632] x 100 = -87.5%
Formula
Percentage change = [(79 - 632) / 632] x 100
Subtract the new number by the original number
79 - 632 = -553
-553 ÷ 632 = -0.875
-0.875 x 100 = -87.5%
Example