-39.3% is the change from 257 to 156
Calculation steps:
[( 156 - 257 ) ÷ 257] x 100 = -39.3%
Formula
Percentage change = [(156 - 257) / 257] x 100
Subtract the new number by the original number
156 - 257 = -101
-101 ÷ 257 = -0.39299610894941633
-0.39299610894941633 x 100 = -39.3%