-18.43% is the change from 255 to 208
Calculation steps:
[( 208 - 255 ) ÷ 255] x 100 = -18.43%
Formula
Percentage change = [(208 - 255) / 255] x 100
Subtract the new number by the original number
208 - 255 = -47
-47 ÷ 255 = -0.1843137254901961
-0.1843137254901961 x 100 = -18.43%