-95.16% is the change from 620 to 30
Calculation steps:
[( 30 - 620 ) ÷ 620] x 100 = -95.16%
Formula
Percentage change = [(30 - 620) / 620] x 100
Subtract the new number by the original number
30 - 620 = -590
-590 ÷ 620 = -0.9516129032258065
-0.9516129032258065 x 100 = -95.16%