-91.2% is the change from 977 to 86
Calculation steps:
[( 86 - 977 ) ÷ 977] x 100 = -91.2%
Formula
Percentage change = [(86 - 977) / 977] x 100
Subtract the new number by the original number
86 - 977 = -891
-891 ÷ 977 = -0.9119754350051177
-0.9119754350051177 x 100 = -91.2%