-86.61% is the change from 605 to 81
Calculation steps:
[( 81 - 605 ) ÷ 605] x 100 = -86.61%
Formula
Percentage change = [(81 - 605) / 605] x 100
Subtract the new number by the original number
81 - 605 = -524
-524 ÷ 605 = -0.8661157024793389
-0.8661157024793389 x 100 = -86.61%