-98.54% is the change from 821 to 12
Calculation steps:
[( 12 - 821 ) ÷ 821] x 100 = -98.54%
Formula
Percentage change = [(12 - 821) / 821] x 100
Subtract the new number by the original number
12 - 821 = -809
-809 ÷ 821 = -0.9853836784409257
-0.9853836784409257 x 100 = -98.54%