-87.12% is the change from 629 to 81
Calculation steps:
[( 81 - 629 ) ÷ 629] x 100 = -87.12%
Formula
Percentage change = [(81 - 629) / 629] x 100
Subtract the new number by the original number
81 - 629 = -548
-548 ÷ 629 = -0.8712241653418124
-0.8712241653418124 x 100 = -87.12%