-98.23% is the change from 620 to 11
Calculation steps:
[( 11 - 620 ) ÷ 620] x 100 = -98.23%
Formula
Percentage change = [(11 - 620) / 620] x 100
Subtract the new number by the original number
11 - 620 = -609
-609 ÷ 620 = -0.9822580645161291
-0.9822580645161291 x 100 = -98.23%