-86.54% is the change from 602 to 81
Calculation steps:
[( 81 - 602 ) ÷ 602] x 100 = -86.54%
Formula
Percentage change = [(81 - 602) / 602] x 100
Subtract the new number by the original number
81 - 602 = -521
-521 ÷ 602 = -0.8654485049833887
-0.8654485049833887 x 100 = -86.54%