-24.48% is the change from 821 to 620
Calculation steps:
[( 620 - 821 ) ÷ 821] x 100 = -24.48%
Formula
Percentage change = [(620 - 821) / 821] x 100
Subtract the new number by the original number
620 - 821 = -201
-201 ÷ 821 = -0.24482338611449453
-0.24482338611449453 x 100 = -24.48%