-90.69% is the change from 977 to 91
Calculation steps:
[( 91 - 977 ) ÷ 977] x 100 = -90.69%
Formula
Percentage change = [(91 - 977) / 977] x 100
Subtract the new number by the original number
91 - 977 = -886
-886 ÷ 977 = -0.9068577277379734
-0.9068577277379734 x 100 = -90.69%