-98.16% is the change from 977 to 18
Calculation steps:
[( 18 - 977 ) ÷ 977] x 100 = -98.16%
Formula
Percentage change = [(18 - 977) / 977] x 100
Subtract the new number by the original number
18 - 977 = -959
-959 ÷ 977 = -0.9815762538382804
-0.9815762538382804 x 100 = -98.16%