-98.87% is the change from 620 to 7
Calculation steps:
[( 7 - 620 ) ÷ 620] x 100 = -98.87%
Formula
Percentage change = [(7 - 620) / 620] x 100
Subtract the new number by the original number
7 - 620 = -613
-613 ÷ 620 = -0.9887096774193549
-0.9887096774193549 x 100 = -98.87%