-14.51% is the change from 255 to 218
Calculation steps:
[( 218 - 255 ) ÷ 255] x 100 = -14.51%
Formula
Percentage change = [(218 - 255) / 255] x 100
Subtract the new number by the original number
218 - 255 = -37
-37 ÷ 255 = -0.1450980392156863
-0.1450980392156863 x 100 = -14.51%