5405.56% is the change from 18 to 991
Calculation steps:
[( 991 - 18 ) ÷ 18] x 100 = 5405.56%
Formula
Percentage change = [(991 - 18) / 18] x 100
Subtract the new number by the original number
991 - 18 = 973
973 ÷ 18 = 54.05555555555556
54.05555555555556 x 100 = 5405.56%