-51.7% is the change from 528 to 255
Calculation steps:
[( 255 - 528 ) ÷ 528] x 100 = -51.7%
Formula
Percentage change = [(255 - 528) / 528] x 100
Subtract the new number by the original number
255 - 528 = -273
-273 ÷ 528 = -0.5170454545454546
-0.5170454545454546 x 100 = -51.7%