-20.22% is the change from 821 to 655
Calculation steps:
[( 655 - 821 ) ÷ 821] x 100 = -20.22%
Formula
Percentage change = [(655 - 821) / 821] x 100
Subtract the new number by the original number
655 - 821 = -166
-166 ÷ 821 = -0.20219244823386115
-0.20219244823386115 x 100 = -20.22%