-9.21% is the change from 977 to 887
Calculation steps:
[( 887 - 977 ) ÷ 977] x 100 = -9.21%
Formula
Percentage change = [(887 - 977) / 977] x 100
Subtract the new number by the original number
887 - 977 = -90
-90 ÷ 977 = -0.09211873080859775
-0.09211873080859775 x 100 = -9.21%