-90.07% is the change from 977 to 97
Calculation steps:
[( 97 - 977 ) ÷ 977] x 100 = -90.07%
Formula
Percentage change = [(97 - 977) / 977] x 100
Subtract the new number by the original number
97 - 977 = -880
-880 ÷ 977 = -0.9007164790174002
-0.9007164790174002 x 100 = -90.07%