-86.3% is the change from 613 to 84
Calculation steps:
[( 84 - 613 ) ÷ 613] x 100 = -86.3%
Formula
Percentage change = [(84 - 613) / 613] x 100
Subtract the new number by the original number
84 - 613 = -529
-529 ÷ 613 = -0.8629690048939641
-0.8629690048939641 x 100 = -86.3%