-84.01% is the change from 619 to 99
Calculation steps:
[( 99 - 619 ) ÷ 619] x 100 = -84.01%
Formula
Percentage change = [(99 - 619) / 619] x 100
Subtract the new number by the original number
99 - 619 = -520
-520 ÷ 619 = -0.840064620355412
-0.840064620355412 x 100 = -84.01%