-83.22% is the change from 590 to 99
Calculation steps:
[( 99 - 590 ) ÷ 590] x 100 = -83.22%
Formula
Percentage change = [(99 - 590) / 590] x 100
Subtract the new number by the original number
99 - 590 = -491
-491 ÷ 590 = -0.8322033898305085
-0.8322033898305085 x 100 = -83.22%