-98.42% is the change from 821 to 13
Calculation steps:
[( 13 - 821 ) ÷ 821] x 100 = -98.42%
Formula
Percentage change = [(13 - 821) / 821] x 100
Subtract the new number by the original number
13 - 821 = -808
-808 ÷ 821 = -0.9841656516443362
-0.9841656516443362 x 100 = -98.42%