-73.61% is the change from 970 to 256
Calculation steps:
[( 256 - 970 ) ÷ 970] x 100 = -73.61%
Formula
Percentage change = [(256 - 970) / 970] x 100
Subtract the new number by the original number
256 - 970 = -714
-714 ÷ 970 = -0.7360824742268042
-0.7360824742268042 x 100 = -73.61%