-17.36% is the change from 311 to 257
Calculation steps:
[( 257 - 311 ) ÷ 311] x 100 = -17.36%
Formula
Percentage change = [(257 - 311) / 311] x 100
Subtract the new number by the original number
257 - 311 = -54
-54 ÷ 311 = -0.17363344051446947
-0.17363344051446947 x 100 = -17.36%