-98.71% is the change from 620 to 8
Calculation steps:
[( 8 - 620 ) ÷ 620] x 100 = -98.71%
Formula
Percentage change = [(8 - 620) / 620] x 100
Subtract the new number by the original number
8 - 620 = -612
-612 ÷ 620 = -0.9870967741935484
-0.9870967741935484 x 100 = -98.71%