-86.43% is the change from 597 to 81
Calculation steps:
[( 81 - 597 ) ÷ 597] x 100 = -86.43%
Formula
Percentage change = [(81 - 597) / 597] x 100
Subtract the new number by the original number
81 - 597 = -516
-516 ÷ 597 = -0.864321608040201
-0.864321608040201 x 100 = -86.43%