-17.9% is the change from 257 to 211
Calculation steps:
[( 211 - 257 ) ÷ 257] x 100 = -17.9%
Formula
Percentage change = [(211 - 257) / 257] x 100
Subtract the new number by the original number
211 - 257 = -46
-46 ÷ 257 = -0.17898832684824903
-0.17898832684824903 x 100 = -17.9%