-0.91% is the change from 987 to 978
Calculation steps:
[( 978 - 987 ) ÷ 987] x 100 = -0.91%
Formula
Percentage change = [(978 - 987) / 987] x 100
Subtract the new number by the original number
978 - 987 = -9
-9 ÷ 987 = -0.00911854103343465
-0.00911854103343465 x 100 = -0.91%