-91.79% is the change from 987 to 81
Calculation steps:
[( 81 - 987 ) ÷ 987] x 100 = -91.79%
Formula
Percentage change = [(81 - 987) / 987] x 100
Subtract the new number by the original number
81 - 987 = -906
-906 ÷ 987 = -0.9179331306990881
-0.9179331306990881 x 100 = -91.79%