-86.77% is the change from 257 to 34
Calculation steps:
[( 34 - 257 ) ÷ 257] x 100 = -86.77%
Formula
Percentage change = [(34 - 257) / 257] x 100
Subtract the new number by the original number
34 - 257 = -223
-223 ÷ 257 = -0.867704280155642
-0.867704280155642 x 100 = -86.77%