-1.58% is the change from 821 to 808
Calculation steps:
[( 808 - 821 ) ÷ 821] x 100 = -1.58%
Formula
Percentage change = [(808 - 821) / 821] x 100
Subtract the new number by the original number
808 - 821 = -13
-13 ÷ 821 = -0.015834348355663823
-0.015834348355663823 x 100 = -1.58%