-54.95% is the change from 566 to 255
Calculation steps:
[( 255 - 566 ) ÷ 566] x 100 = -54.95%
Formula
Percentage change = [(255 - 566) / 566] x 100
Subtract the new number by the original number
255 - 566 = -311
-311 ÷ 566 = -0.549469964664311
-0.549469964664311 x 100 = -54.95%