-73.9% is the change from 977 to 255
Calculation steps:
[( 255 - 977 ) ÷ 977] x 100 = -73.9%
Formula
Percentage change = [(255 - 977) / 977] x 100
Subtract the new number by the original number
255 - 977 = -722
-722 ÷ 977 = -0.7389969293756398
-0.7389969293756398 x 100 = -73.9%