-74.27% is the change from 991 to 255
Calculation steps:
[( 255 - 991 ) ÷ 991] x 100 = -74.27%
Formula
Percentage change = [(255 - 991) / 991] x 100
Subtract the new number by the original number
255 - 991 = -736
-736 ÷ 991 = -0.7426841574167508
-0.7426841574167508 x 100 = -74.27%