-87.02% is the change from 624 to 81
Calculation steps:
[( 81 - 624 ) ÷ 624] x 100 = -87.02%
Formula
Percentage change = [(81 - 624) / 624] x 100
Subtract the new number by the original number
81 - 624 = -543
-543 ÷ 624 = -0.8701923076923077
-0.8701923076923077 x 100 = -87.02%