-2.33% is the change from 257 to 251
Calculation steps:
[( 251 - 257 ) ÷ 257] x 100 = -2.33%
Formula
Percentage change = [(251 - 257) / 257] x 100
Subtract the new number by the original number
251 - 257 = -6
-6 ÷ 257 = -0.023346303501945526
-0.023346303501945526 x 100 = -2.33%