-84.66% is the change from 528 to 81
Calculation steps:
[( 81 - 528 ) ÷ 528] x 100 = -84.66%
Formula
Percentage change = [(81 - 528) / 528] x 100
Subtract the new number by the original number
81 - 528 = -447
-447 ÷ 528 = -0.8465909090909091
-0.8465909090909091 x 100 = -84.66%