-6.88% is the change from 276 to 257
Calculation steps:
[( 257 - 276 ) ÷ 276] x 100 = -6.88%
Formula
Percentage change = [(257 - 276) / 276] x 100
Subtract the new number by the original number
257 - 276 = -19
-19 ÷ 276 = -0.06884057971014493
-0.06884057971014493 x 100 = -6.88%