-73.74% is the change from 971 to 255
Calculation steps:
[( 255 - 971 ) ÷ 971] x 100 = -73.74%
Formula
Percentage change = [(255 - 971) / 971] x 100
Subtract the new number by the original number
255 - 971 = -716
-716 ÷ 971 = -0.737384140061792
-0.737384140061792 x 100 = -73.74%