-6.57% is the change from 274 to 256
Calculation steps:
[( 256 - 274 ) ÷ 274] x 100 = -6.57%
Formula
Percentage change = [(256 - 274) / 274] x 100
Subtract the new number by the original number
256 - 274 = -18
-18 ÷ 274 = -0.06569343065693431
-0.06569343065693431 x 100 = -6.57%