-86.78% is the change from 590 to 78
Calculation steps:
[( 78 - 590 ) ÷ 590] x 100 = -86.78%
Formula
Percentage change = [(78 - 590) / 590] x 100
Subtract the new number by the original number
78 - 590 = -512
-512 ÷ 590 = -0.8677966101694915
-0.8677966101694915 x 100 = -86.78%