-73.8% is the change from 977 to 256
Calculation steps:
[( 256 - 977 ) ÷ 977] x 100 = -73.8%
Formula
Percentage change = [(256 - 977) / 977] x 100
Subtract the new number by the original number
256 - 977 = -721
-721 ÷ 977 = -0.7379733879222109
-0.7379733879222109 x 100 = -73.8%