-83.85% is the change from 613 to 99
Calculation steps:
[( 99 - 613 ) ÷ 613] x 100 = -83.85%
Formula
Percentage change = [(99 - 613) / 613] x 100
Subtract the new number by the original number
99 - 613 = -514
-514 ÷ 613 = -0.8384991843393148
-0.8384991843393148 x 100 = -83.85%