-86.89% is the change from 618 to 81
Calculation steps:
[( 81 - 618 ) ÷ 618] x 100 = -86.89%
Formula
Percentage change = [(81 - 618) / 618] x 100
Subtract the new number by the original number
81 - 618 = -537
-537 ÷ 618 = -0.8689320388349514
-0.8689320388349514 x 100 = -86.89%