-16.94% is the change from 307 to 255
Calculation steps:
[( 255 - 307 ) ÷ 307] x 100 = -16.94%
Formula
Percentage change = [(255 - 307) / 307] x 100
Subtract the new number by the original number
255 - 307 = -52
-52 ÷ 307 = -0.16938110749185667
-0.16938110749185667 x 100 = -16.94%